FaceTime Drops Calls immediately after dialing

I cannot use FaceTime on my IMac- Sequoia 15.7.1. It works perfectly on my mini, on my iPad and on my iPhone.

Issue:

When I initiate the call from my IMac, it connects and then drops the call.

When I try to initiate a call from another device top the IMac, it doesn't connect; screen shot from iPhone below.

[Edited by Moderator]