I cannot sign into Messages on iMac with my Apple ID and password?

Hi again,

Try reading through this article, trying every step: If you can't sign in to your iMessage account or FaceTime on your Mac - Apple Support.

Cheers,

Jack

Hi AbacoRick,

What error message do you see?

Also, what version of Mac OS version are you running? (Go to the Apple menu (top left) > About This Mac.)

Cheers,

Jack