I finally got the video to play by going to the Signing & Capabilities tab in the Project Settings and checked Outgoing Connections (Client) under App Sandbox. Apple should make note of this requirement in their guide. However, I am still getting the following errors in the console: 2021-03-30 14:45:34.347266-0500 Streamer[12701:657907] [plugin] AddInstanceForFactory: No factory registered for id CFUUID 0x600003974980 F8BB1C28-BAE8-11D6-9C31-00039315CD46 2021-03-30 14:45:34.474219-0500 Streamer[12701:657916] validateSessionInfo: bundleID is invalid. Please specify the bundleID for kRTCReportingSessionInfoClientBundleID 2021-03-30 14:45:34.475221-0500 Streamer[12701:657894] startConfigurationWithCompletionHandler: Failed to get remote object proxy: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.rtcreportingd" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.rtcreportingd} 2021-03-30 14:45:34.475366-0500 Streamer[12701:657894] startConfigurationWithCompletionHandler: Failed to get remote object proxy: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.rtcreportingd" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.rtcreportingd} 2021-03-30 14:45:34.507482-0500 Streamer[12701:657907] [logging] volume does not support data protection, stripping SQLITE_OPENFILEPROTECTION* flags 2021-03-30 14:45:34.513188-0500 Streamer[12701:657907] [logging] volume does not support data protection, stripping SQLITE_OPENFILEPROTECTION* flags 2021-03-30 14:45:34.654719-0500 Streamer[12701:657415] Metal API Validation Enabled 2021-03-30 14:45:35.304861-0500 Streamer[12701:657894] sendMessageWithDictionary: Failed to get remote object proxy: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.rtcreportingd" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.rtcreportingd} 2021-03-30 14:45:35.963419-0500 Streamer[12701:657895] sendMessageWithDictionary: Failed to get remote object proxy: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.rtcreportingd" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.rtcreportingd} 2021-03-30 14:45:40.709591-0500 Streamer[12701:657896] sendMessageWithDictionary: Failed to get remote object proxy: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.rtcreportingd" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.rtcreportingd} 2021-03-30 14:45:40.809438-0500 Streamer[12701:657895] sendMessageWithDictionary: Failed to get remote object proxy: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.rtcreportingd" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.rtcreportingd} 2021-03-30 14:45:41.075516-0500 Streamer[12701:657896] sendMessageWithDictionary: Failed to get remote object proxy: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.rtcreportingd" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.rtcreportingd} 2021-03-30 14:45:41.787596-0500 Streamer[12701:657894] sendMessageWithDictionary: Failed to get remote object proxy: Error Domain=NSCocoaErrorDomain Code=4097 "connection to service on pid 0 named com.apple.rtcreportingd" UserInfo={NSDebugDescription=connection to service on pid 0 named com.apple.rtcreportingd} 2021-03-30 14:45:42.762731-0500 Streamer[12701:657896] [connection] nw_connection_add_timestamp_locked_on_nw_queue [C1] Hit maximum timestamp count, will start dropping events

@Claude31, that solution only disables the scrollWheel. It does not turn off the scrollbars in the enclosingScrollView, and the user can still grab the scroll bars and drag the webView up or down or left to right. I even tried webView.enclosingScrollView.hasHorizontalScroller = false and webView.enclosingScrollView.hasVerticalScroller = false and that doesn't remove the scroll bars either.

Did you ever get this figured out? I'm facing the same issue on macOS.

Has anyone tried following the referenced Apple document and successfully ran it in macOS Big Sur?

@OOPer, your solution doesn't work for me. This is now showing up on my console, but not causing a crash. The audio (mp3 file) still plays as expected. I use AVAudioPlayer from AVFoundation in my code on macOS Big Sur, XCode 12.3, Swift 5.3. I building a macOS app, not iOS. I declare my player as var player:AVAudioPlayer? (I had it also as AVAudioPlayer!) and both produce the same console message above. Like I wrote above, the audio still plays, but I would like to get this resolved so the message no longer appears. I stepped through my code and the error is appearing immediately upon calling player?.prepareToPlay() method. EDIT: Subsequent calls to this method does not reproduce the error in the console. It is only happening upon the initial call to this method. If I play a subsequent mp3 file it doesn't repappear. if player?.prepareToPlay() != nil { Thanks to anyone who can suggest how to resolve this.