API diff: Microsoft.MacCatalyst.dll Microsoft.MacCatalyst.dll Namespace BackgroundAssets New Type: BackgroundAssets.BAErrorCode [Serializable] public enum BAErrorCode { CallFromExtensionNotAllowed = 50, CallFromInactiveProcessNotAllowed = 51, CallerConnectionInvalid = 56, CallerConnectionNotAccepted = 55, DownloadAlreadyFailed = 103, DownloadAlreadyScheduled = 100, DownloadBackgroundActivityProhibited = 111, DownloadEssentialDownloadNotPermitted = 109, DownloadFailedToStart = 102, DownloadInvalid = 0, DownloadNotScheduled = 101, DownloadWouldExceedAllowance = 112, SessionDownloadAllowanceExceeded = 204, SessionDownloadDisallowedByAllowance = 203, SessionDownloadDisallowedByDomain = 202, SessionDownloadNotPermittedBeforeAppLaunch = 206, } New Type: BackgroundAssets.BAErrorCodeExtensions public static class BAErrorCodeExtensions { // methods public static Foundation.NSString GetDomain (this BAErrorCode self); }