Homekit Secure video doesn't work on _one_ mac

Hello Nicholas Sayer.

Thank you for using Apple Support Communities. It sounds like you're experiencing issues attempting to use Secure Video with one of your Macs. We can understand how this would be an issue. Allow us to investigate this issue and assist in any way we can.

We appreciate you sharing these details with us. It's a good thing that all your devices are fully updated. Since this issue only occurring with one specific Mac, we'll concentrate our troubleshooting on that Mac. Ever since this issue started to occur, have you been able to restart all linked devices that are using HomeKit, including the home hub? If you haven't yet, please do so:

Restart your iPhone - Apple Support

Restart your iPad - Apple Support

Log out, sleep, wake, restart, or shut down your Mac - Apple Support

This is usually a great basic step to attempt for troubleshooting HomeKit issues. If this doesn't help, you'll want to make sure Bluetooth and Wi-Fi are properly enabled on your Mac mini M1:

Turn Bluetooth on or off on Mac - Apple Support

Manage the Wi-Fi connection on your Mac - Apple Support

If everything is properly set up, you might have to remove this specific accessory and re-add it to the Home app:

Add a HomeKit accessory to the Home app - Apple Support

Feel free to keep us posted. Cheers.

Hey there!

Thanks for updating us. Sometimes issues might arise that prevent your accessories from communicating properly to your devices or single device. Removing the affect accessories and re-adding it would be a recommend troubleshooting step to attempt. This could potentially help resolve this issues. However, if you don't wish to attempt this now, you can do so at a later time. You can also test your Mac in safe mode to see if a software conflict might be causing this specific issue. Just in case, the following resource can show you how to boot up in safe mode:

Start up your Mac in safe mode - Apple Support

For your specific Mac, follow the section under "Start up a Mac with Apple silicon in safe mode". If you do attempt to remove and re-add your accessory to the Home app, and you continue to experience issues, please reach out to Apple Support for help. You can reach them by using the link below:

Get Support

Thank you for using Apple Support Communities. Best of luck.

https://discussions.apple.com/thread/252132098

Please refer.

It is ridiculous that half a year later, 11.4 version still can not solve this problem.