iMessage error on login

I have a 2019 27" iMac running Ventura at work; work iCloud account. I used to sign in to Messages, using my personal iCloud login so I could to communicate with people off-site so I wouldn't have to use my iPhone. I would sign out and remove my Apple ID so no one could log in. Now I get this message every time I re-boot my Mac:

It's happening to others as well. How do I get rid of this?

Mike Boatner