diff --git a/Emby.Server.Implementations/ApplicationHost.cs b/Emby.Server.Implementations/ApplicationHost.cs
index 745753440..acabbb059 100644
--- a/Emby.Server.Implementations/ApplicationHost.cs
+++ b/Emby.Server.Implementations/ApplicationHost.cs
@@ -146,7 +146,7 @@ namespace Emby.Server.Implementations
             _startupConfig = startupConfig;
 
             Logger = LoggerFactory.CreateLogger<ApplicationHost>();
-            _deviceId = new DeviceId(ApplicationPaths, LoggerFactory);
+            _deviceId = new DeviceId(ApplicationPaths, LoggerFactory.CreateLogger<DeviceId>());
 
             ApplicationVersion = typeof(ApplicationHost).Assembly.GetName().Version;
             ApplicationVersionString = ApplicationVersion.ToString(3);
diff --git a/Emby.Server.Implementations/Devices/DeviceId.cs b/Emby.Server.Implementations/Devices/DeviceId.cs
index b3f5549bc..2459178d8 100644
--- a/Emby.Server.Implementations/Devices/DeviceId.cs
+++ b/Emby.Server.Implementations/Devices/DeviceId.cs
@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;
@@ -17,19 +15,19 @@ namespace Emby.Server.Implementations.Devices
         private readonly ILogger<DeviceId> _logger;
         private readonly object _syncLock = new object();
 
-        private string _id;
+        private string? _id;
 
-        public DeviceId(IApplicationPaths appPaths, ILoggerFactory loggerFactory)
+        public DeviceId(IApplicationPaths appPaths, ILogger<DeviceId> logger)
         {
             _appPaths = appPaths;
-            _logger = loggerFactory.CreateLogger<DeviceId>();
+            _logger = logger;
         }
 
-        public string Value => _id ?? (_id = GetDeviceId());
+        public string Value => _id ??= GetDeviceId();
 
         private string CachePath => Path.Combine(_appPaths.DataPath, "device.txt");
 
-        private string GetCachedId()
+        private string? GetCachedId()
         {
             try
             {
@@ -65,7 +63,7 @@ namespace Emby.Server.Implementations.Devices
             {
                 var path = CachePath;
 
-                Directory.CreateDirectory(Path.GetDirectoryName(path));
+                Directory.CreateDirectory(Path.GetDirectoryName(path) ?? throw new InvalidOperationException("Path can't be a root directory."));
 
                 lock (_syncLock)
                 {
diff --git a/Emby.Server.Implementations/Library/LiveStreamHelper.cs b/Emby.Server.Implementations/Library/LiveStreamHelper.cs
index d4aeae41a..0ebfe3ae7 100644
--- a/Emby.Server.Implementations/Library/LiveStreamHelper.cs
+++ b/Emby.Server.Implementations/Library/LiveStreamHelper.cs
@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;
@@ -37,16 +35,16 @@ namespace Emby.Server.Implementations.Library
             _appPaths = appPaths;
         }
 
-        public async Task AddMediaInfoWithProbe(MediaSourceInfo mediaSource, bool isAudio, string cacheKey, bool addProbeDelay, CancellationToken cancellationToken)
+        public async Task AddMediaInfoWithProbe(MediaSourceInfo mediaSource, bool isAudio, string? cacheKey, bool addProbeDelay, CancellationToken cancellationToken)
         {
             var originalRuntime = mediaSource.RunTimeTicks;
 
             var now = DateTime.UtcNow;
 
-            MediaInfo mediaInfo = null;
+            MediaInfo? mediaInfo = null;
             var cacheFilePath = string.IsNullOrEmpty(cacheKey) ? null : Path.Combine(_appPaths.CachePath, "mediainfo", cacheKey.GetMD5().ToString("N", CultureInfo.InvariantCulture) + ".json");
 
-            if (!string.IsNullOrEmpty(cacheKey))
+            if (cacheFilePath is not null)
             {
                 try
                 {
@@ -91,7 +89,7 @@ namespace Emby.Server.Implementations.Library
 
                 if (cacheFilePath is not null)
                 {
-                    Directory.CreateDirectory(Path.GetDirectoryName(cacheFilePath));
+                    Directory.CreateDirectory(Path.GetDirectoryName(cacheFilePath) ?? throw new InvalidOperationException("Path can't be a root directory."));
                     FileStream createStream = AsyncFile.OpenWrite(cacheFilePath);
                     await using (createStream.ConfigureAwait(false))
                     {
diff --git a/Emby.Server.Implementations/Library/MusicManager.cs b/Emby.Server.Implementations/Library/MusicManager.cs
index 078f4ad21..a69a0f33f 100644
--- a/Emby.Server.Implementations/Library/MusicManager.cs
+++ b/Emby.Server.Implementations/Library/MusicManager.cs
@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;
@@ -13,7 +11,6 @@ using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.Audio;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Playlists;
-using MediaBrowser.Model.Querying;
 using MusicAlbum = MediaBrowser.Controller.Entities.Audio.MusicAlbum;
 
 namespace Emby.Server.Implementations.Library
@@ -27,33 +24,35 @@ namespace Emby.Server.Implementations.Library
             _libraryManager = libraryManager;
         }
 
-        public List<BaseItem> GetInstantMixFromSong(Audio item, User user, DtoOptions dtoOptions)
+        public List<BaseItem> GetInstantMixFromSong(Audio item, User? user, DtoOptions dtoOptions)
         {
-            var list = new List<Audio>
+            var list = new List<BaseItem>
             {
                 item
             };
 
-            return list.Concat(GetInstantMixFromGenres(item.Genres, user, dtoOptions)).ToList();
+            list.AddRange(GetInstantMixFromGenres(item.Genres, user, dtoOptions));
+
+            return list;
         }
 
         /// <inheritdoc />
-        public List<BaseItem> GetInstantMixFromArtist(MusicArtist artist, User user, DtoOptions dtoOptions)
+        public List<BaseItem> GetInstantMixFromArtist(MusicArtist artist, User? user, DtoOptions dtoOptions)
         {
             return GetInstantMixFromGenres(artist.Genres, user, dtoOptions);
         }
 
-        public List<BaseItem> GetInstantMixFromAlbum(MusicAlbum item, User user, DtoOptions dtoOptions)
+        public List<BaseItem> GetInstantMixFromAlbum(MusicAlbum item, User? user, DtoOptions dtoOptions)
         {
             return GetInstantMixFromGenres(item.Genres, user, dtoOptions);
         }
 
-        public List<BaseItem> GetInstantMixFromFolder(Folder item, User user, DtoOptions dtoOptions)
+        public List<BaseItem> GetInstantMixFromFolder(Folder item, User? user, DtoOptions dtoOptions)
         {
             var genres = item
                .GetRecursiveChildren(user, new InternalItemsQuery(user)
                {
-                   IncludeItemTypes = new[] { BaseItemKind.Audio },
+                   IncludeItemTypes = [BaseItemKind.Audio],
                    DtoOptions = dtoOptions
                })
                .Cast<Audio>()
@@ -64,12 +63,12 @@ namespace Emby.Server.Implementations.Library
             return GetInstantMixFromGenres(genres, user, dtoOptions);
         }
 
-        public List<BaseItem> GetInstantMixFromPlaylist(Playlist item, User user, DtoOptions dtoOptions)
+        public List<BaseItem> GetInstantMixFromPlaylist(Playlist item, User? user, DtoOptions dtoOptions)
         {
             return GetInstantMixFromGenres(item.Genres, user, dtoOptions);
         }
 
-        public List<BaseItem> GetInstantMixFromGenres(IEnumerable<string> genres, User user, DtoOptions dtoOptions)
+        public List<BaseItem> GetInstantMixFromGenres(IEnumerable<string> genres, User? user, DtoOptions dtoOptions)
         {
             var genreIds = genres.DistinctNames().Select(i =>
             {
@@ -86,27 +85,23 @@ namespace Emby.Server.Implementations.Library
             return GetInstantMixFromGenreIds(genreIds, user, dtoOptions);
         }
 
-        public List<BaseItem> GetInstantMixFromGenreIds(Guid[] genreIds, User user, DtoOptions dtoOptions)
+        public List<BaseItem> GetInstantMixFromGenreIds(Guid[] genreIds, User? user, DtoOptions dtoOptions)
         {
             return _libraryManager.GetItemList(new InternalItemsQuery(user)
             {
-                IncludeItemTypes = new[] { BaseItemKind.Audio },
-
-                GenreIds = genreIds.ToArray(),
-
+                IncludeItemTypes = [BaseItemKind.Audio],
+                GenreIds = genreIds,
                 Limit = 200,
-
-                OrderBy = new[] { (ItemSortBy.Random, SortOrder.Ascending) },
-
+                OrderBy = [(ItemSortBy.Random, SortOrder.Ascending)],
                 DtoOptions = dtoOptions
             });
         }
 
-        public List<BaseItem> GetInstantMixFromItem(BaseItem item, User user, DtoOptions dtoOptions)
+        public List<BaseItem> GetInstantMixFromItem(BaseItem item, User? user, DtoOptions dtoOptions)
         {
             if (item is MusicGenre)
             {
-                return GetInstantMixFromGenreIds(new[] { item.Id }, user, dtoOptions);
+                return GetInstantMixFromGenreIds([item.Id], user, dtoOptions);
             }
 
             if (item is Playlist playlist)
diff --git a/Emby.Server.Implementations/Library/SearchEngine.cs b/Emby.Server.Implementations/Library/SearchEngine.cs
index 020cb517d..7f3f8615e 100644
--- a/Emby.Server.Implementations/Library/SearchEngine.cs
+++ b/Emby.Server.Implementations/Library/SearchEngine.cs
@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;
@@ -29,7 +27,7 @@ namespace Emby.Server.Implementations.Library
 
         public QueryResult<SearchHintInfo> GetSearchHints(SearchQuery query)
         {
-            User user = null;
+            User? user = null;
             if (!query.UserId.IsEmpty())
             {
                 user = _userManager.GetUserById(query.UserId);
@@ -69,7 +67,7 @@ namespace Emby.Server.Implementations.Library
         /// <param name="user">The user.</param>
         /// <returns>IEnumerable{SearchHintResult}.</returns>
         /// <exception cref="ArgumentException"><c>query.SearchTerm</c> is <c>null</c> or empty.</exception>
-        private List<SearchHintInfo> GetSearchHints(SearchQuery query, User user)
+        private List<SearchHintInfo> GetSearchHints(SearchQuery query, User? user)
         {
             var searchTerm = query.SearchTerm;
 
@@ -78,7 +76,7 @@ namespace Emby.Server.Implementations.Library
             searchTerm = searchTerm.Trim().RemoveDiacritics();
 
             var excludeItemTypes = query.ExcludeItemTypes.ToList();
-            var includeItemTypes = (query.IncludeItemTypes ?? Array.Empty<BaseItemKind>()).ToList();
+            var includeItemTypes = query.IncludeItemTypes.ToList();
 
             excludeItemTypes.Add(BaseItemKind.Year);
             excludeItemTypes.Add(BaseItemKind.Folder);
@@ -179,7 +177,7 @@ namespace Emby.Server.Implementations.Library
             {
                 if (!searchQuery.ParentId.IsEmpty())
                 {
-                    searchQuery.AncestorIds = new[] { searchQuery.ParentId };
+                    searchQuery.AncestorIds = [searchQuery.ParentId];
                     searchQuery.ParentId = Guid.Empty;
                 }
 
diff --git a/MediaBrowser.Controller/Channels/IHasCacheKey.cs b/MediaBrowser.Controller/Channels/IHasCacheKey.cs
index 9fae43033..7d5207c34 100644
--- a/MediaBrowser.Controller/Channels/IHasCacheKey.cs
+++ b/MediaBrowser.Controller/Channels/IHasCacheKey.cs
@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 namespace MediaBrowser.Controller.Channels
@@ -11,6 +9,6 @@ namespace MediaBrowser.Controller.Channels
         /// </summary>
         /// <param name="userId">The user identifier.</param>
         /// <returns>System.String.</returns>
-        string GetCacheKey(string userId);
+        string? GetCacheKey(string? userId);
     }
 }
diff --git a/MediaBrowser.Controller/Channels/ISearchableChannel.cs b/MediaBrowser.Controller/Channels/ISearchableChannel.cs
deleted file mode 100644
index b87943a6e..000000000
--- a/MediaBrowser.Controller/Channels/ISearchableChannel.cs
+++ /dev/null
@@ -1,21 +0,0 @@
-#nullable disable
-
-#pragma warning disable CS1591
-
-using System.Collections.Generic;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace MediaBrowser.Controller.Channels
-{
-    public interface ISearchableChannel
-    {
-        /// <summary>
-        /// Searches the specified search term.
-        /// </summary>
-        /// <param name="searchInfo">The search information.</param>
-        /// <param name="cancellationToken">The cancellation token.</param>
-        /// <returns>Task{IEnumerable{ChannelItemInfo}}.</returns>
-        Task<IEnumerable<ChannelItemInfo>> Search(ChannelSearchInfo searchInfo, CancellationToken cancellationToken);
-    }
-}
diff --git a/MediaBrowser.Controller/Channels/ISupportsLatestMedia.cs b/MediaBrowser.Controller/Channels/ISupportsLatestMedia.cs
index 8ad93387e..8ecc68bab 100644
--- a/MediaBrowser.Controller/Channels/ISupportsLatestMedia.cs
+++ b/MediaBrowser.Controller/Channels/ISupportsLatestMedia.cs
@@ -1,6 +1,4 @@
-#nullable disable
-
-#pragma warning disable CS1591
+#pragma warning disable CS1591
 
 using System.Collections.Generic;
 using System.Threading;
diff --git a/MediaBrowser.Controller/Library/IMusicManager.cs b/MediaBrowser.Controller/Library/IMusicManager.cs
index ec34a868b..93073cc79 100644
--- a/MediaBrowser.Controller/Library/IMusicManager.cs
+++ b/MediaBrowser.Controller/Library/IMusicManager.cs
@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CA1002, CS1591
 
 using System.Collections.Generic;
@@ -19,7 +17,7 @@ namespace MediaBrowser.Controller.Library
         /// <param name="user">The user to use.</param>
         /// <param name="dtoOptions">The options to use.</param>
         /// <returns>List of items.</returns>
-        List<BaseItem> GetInstantMixFromItem(BaseItem item, User user, DtoOptions dtoOptions);
+        List<BaseItem> GetInstantMixFromItem(BaseItem item, User? user, DtoOptions dtoOptions);
 
         /// <summary>
         /// Gets the instant mix from artist.
@@ -28,7 +26,7 @@ namespace MediaBrowser.Controller.Library
         /// <param name="user">The user to use.</param>
         /// <param name="dtoOptions">The options to use.</param>
         /// <returns>List of items.</returns>
-        List<BaseItem> GetInstantMixFromArtist(MusicArtist artist, User user, DtoOptions dtoOptions);
+        List<BaseItem> GetInstantMixFromArtist(MusicArtist artist, User? user, DtoOptions dtoOptions);
 
         /// <summary>
         /// Gets the instant mix from genre.
@@ -37,6 +35,6 @@ namespace MediaBrowser.Controller.Library
         /// <param name="user">The user to use.</param>
         /// <param name="dtoOptions">The options to use.</param>
         /// <returns>List of items.</returns>
-        List<BaseItem> GetInstantMixFromGenres(IEnumerable<string> genres, User user, DtoOptions dtoOptions);
+        List<BaseItem> GetInstantMixFromGenres(IEnumerable<string> genres, User? user, DtoOptions dtoOptions);
     }
 }
diff --git a/MediaBrowser.Model/Search/SearchQuery.cs b/MediaBrowser.Model/Search/SearchQuery.cs
index b91fd8657..8126b8bfc 100644
--- a/MediaBrowser.Model/Search/SearchQuery.cs
+++ b/MediaBrowser.Model/Search/SearchQuery.cs
@@ -1,4 +1,3 @@
-#nullable disable
 #pragma warning disable CS1591
 
 using System;
@@ -31,7 +30,7 @@ namespace MediaBrowser.Model.Search
         /// Gets or sets the search term.
         /// </summary>
         /// <value>The search term.</value>
-        public string SearchTerm { get; set; }
+        public required string SearchTerm { get; set; }
 
         /// <summary>
         /// Gets or sets the start index. Used for paging.
diff --git a/MediaBrowser.Model/System/LogFile.cs b/MediaBrowser.Model/System/LogFile.cs
index aec910c92..d4eb6bafc 100644
--- a/MediaBrowser.Model/System/LogFile.cs
+++ b/MediaBrowser.Model/System/LogFile.cs
@@ -1,4 +1,3 @@
-#nullable disable
 #pragma warning disable CS1591
 
 using System;
@@ -29,6 +28,6 @@ namespace MediaBrowser.Model.System
         /// Gets or sets the name.
         /// </summary>
         /// <value>The name.</value>
-        public string Name { get; set; }
+        public required string Name { get; set; }
     }
 }
diff --git a/src/Jellyfin.LiveTv/Channels/ChannelManager.cs b/src/Jellyfin.LiveTv/Channels/ChannelManager.cs
index 1948a9ab9..cce2911dc 100644
--- a/src/Jellyfin.LiveTv/Channels/ChannelManager.cs
+++ b/src/Jellyfin.LiveTv/Channels/ChannelManager.cs
@@ -570,7 +570,6 @@ namespace Jellyfin.LiveTv.Channels
             return new ChannelFeatures(channel.Name, channel.Id)
             {
                 CanFilter = !features.MaxPageSize.HasValue,
-                CanSearch = provider is ISearchableChannel,
                 ContentTypes = features.ContentTypes.ToArray(),
                 DefaultSortFields = features.DefaultSortFields.ToArray(),
                 MaxPageSize = features.MaxPageSize,