Posting it here because it took me forever to find the solution.  And it worked.  Once I did this, it stopped insisting my username/password was wrong and I haven’t had any issues since.

not sure why this solution is not being spread around more. But to fix this issue, what you have to do it add a “\” before your username. for example:Username: \domain\usernamePassword: whatever your password isMake sure you save to your keychain after. This has worked for me. Im not sure where I found this, but it was a lifesaver. Hope it helps for you!

via Outlook for Mac keeps asking for password on exchange. – Microsoft Community.

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