macOS 13.3 beta - Messages/iMessage Sign-in Error

[SaMaster14]

Anyone else experiencing an issue where, after updating, when you open Messages (or FaceTime for that matter), you get a sign in screen, go ahead and sign in with your correct credentials, and then after it buffers for about a minute, you get an "unknown error occurred" message?

I've reported this to Apple using the Feedback app on my Mac.

Frustrating issue as I use my MacBook Pro for Messages frequently.

All other Apple ID/iCloud services appear to be functioning properly.