iMessage & FaceTime on Mac isn't working. 'Error occurred during activation'
I've been using iMessage and FaceTime on my Mac ever since, and haven't had a problem with it. Only recently it had signed me out of both applications and when I tried logging in on iMessage, a message appears saying 'an error occurred during activation', and when I try logging in on FaceTime, a different message saying 'This account has no reachable addresses. Please sign in to appleid.apple.com in order to add one.' appears. I did go onto that website and added an email address. I have 3 reachable addresses. I am also signed in on an iPad with the same Apple ID and have no problem on there. Can someone help me out?
MacBook Pro 13", macOS 10.15