"An Error Occurred During Activation" when I attempt to log in to Messages on OSX
"An Error Occurred During Activation" when I attempt to log in to Messages. This seems to happen about once a month, and every time the fix seems to be something different. I have no problem logging in to iCloud, and Message works fine on all my other devices. I am running 10.12.6 of the OS. Whenever this happens I am unable to identify any changes that might have caused it... i.e., it seems to happen out of "thin air." I am also being totally barrage with requests to enter my keychain password - not sure if that might be diagnostically relevant. Thanks in advance!
MacBook Pro 15", macOS 10.12