Using New Outlook on Windows for personal email, calendar, and contact management
POTENTIAL SOLUTION: I had deleted and readded my non-functional gmail from Windows Outlook to no avail. Only removed it fr om windows not all devices. This morning had a minor epiphany. Another Gmail account had also gone inactive. I deleted the two offending Gmaill accounts from ALL ACCOUNTS and re-added them. Both are now functioning normally. Peroson Opinion is that in order to fix the problem the info that Outlook stores in the cloud had to be removed.
The fix proposed by Jerry worked for me too. Did not work when I deleted the account from only "this' device. But, when I removed the account from "all" devices and then added it back in, it is now working. Takes some time, but it seems like it is restoring past emails too. Thanks, Jerry!!!
Agree with the above fix. Removing from "all devices" and re-adding the account worked. Took a few mins to resync but all good now.