Help! Can no longer access Messages on desktop
I can no longer log into Messages app on MacBook Pro - after entering the password for my Apple ID, I get the following error:
Could not sign in to iMessage.
An error occurred during activation. Try again.
When skipping the log in, I can still see my old message threads, but all recipient names are red.
And I cannot even delete the "Apple ID (inactive)" in Preferences, since the delete button is greyed out.
Is there any other place where I should be looking to edit the account?
Messages clearly remembers my Apple ID, just doesn't let me log on any longer ...
[ note: Messages still works on a second MacBook Pro running 10.10.5, using another Apple ID ]
MacBook Pro, OS X Yosemite (10.10.5), 2.4 GHz Intel Core i5