FaceTime calls failing on iMac after macOS Sequoia 15.5 update

My husband and I both have iMac Desktop Computers. Both are up-to date with Sequoia 15.5. Our FaceTime calls fail on sending and receiving. This started happening after updating. Tried signing in and out, etc. Help!

[Re-Titled by Moderator]

Original Title: Facetime Calls Failing