First a disclaimer; The Cisco Proximity client isn't being actively maintained, so if you're setting up something new you should consider using e.g. Webex, AirPlay, Miracast or other solutions that might offer the features you want.
Then, yes, you co...
Things to check if the same endpoint was working before
Check the xapi; What are the values of xStatus Audio Ultrasound and xStatus Proximity Services Availability?Are there any related diagnostics under Issues and diagnostics related to audio/ultras...
Was this using the Cisco Proximity app (https://proximity.cisco.com?) Because there, calls that are placed should be outgoing from the desk pro, not incoming from the cloud.
There is (as far as I know) nothing that should prevent the app from working on Apple silicon. There may be other changes to the hardware that means it can't pick up the pairing, but the project is currently not being prioritized, and the only client...
