Unable to verify account name or password
User had our Exchange (Office 365) account installed on his Macbook Air OS X El Capitan version 10.11.6.
We enabled 2 factor authentication to our environment, (Microsoft Authentication app) and kept getting a pop up to enter Exchange password, even though correct one was entered.
So to troubleshoot I deleted the account and trying to add account back, enter the correct info but get a message - unable to verify account name or password, - info is correct as I can log into his account on safari. I even tried logging into my credentials and received the same message.
I'm keen to thinking it is because of the older OS, but wouldn't that have been an issue before?