The Notification should be posted from main thread, if your post is post from escaping closure or other asynchronous ways, the warning will show up. to avoid this, you can post the noti from main thread as: DispatchQueue.main.async {                    NotificationCenter.default.post() } hope could help.

The Notification should be posted from main thread, if your post is post from escaping closure or other asynchronous ways, the warning will show up. to avoid this, you can post the noti from main thread as: DispatchQueue.main.async {                    NotificationCenter.default.post() } hope could help.                 

My iMac 2020 failed installation over beta7. Downloaded and rebooted then required disk passcode, then went to recovery mode and reboot to beta7.

"-[ServiceDelegate listener:shouldAcceptNewConnection:] [Setup] XPC connection rejected due to lack of entitlement." showed by the process "/System/Library/PrivateFrameworks/SiriUI.framework/Versions/A/XPCServices/SiriUISetupXPC.xpc/Contents/MacOS/SiriUISetupXPC " when "Hey Siri" setting crash. Could somebody help?

Just checked the release notes of Big Sur beta 5, it is still not supported on iMac 2020. why is available on my iMac 2020?

Today, Big Sur is available for iMac 2020, but after installation, the screen is blocked at black scree with a Apple, restart by push the power button, it showed Catalina login screen, but can't login. what can I do?

Tried everything I can do，the answers really saved me，thanks.