Outlook 2016 doesn't accept password or app password

Still having issues, though it seems less frequent. I'm using Gmail for android, using eas (exchange account) to a personal outlook.com address (which doesn't support modern auth, so using app password).

I've totally deleted the account from my phone, cleared storage and cache for Gmail. Deleted the phone from outlook online, cleared all app passwords and generated a new one. I'm now trying to re-add it and getting near instant failure.

Throughout the day it was going down for a few minutes at a time, better than previous days but an issue still exists.

All along my desktop Outlook app (using MAPI over HTTPS) has been working fine, never any issue. Obviously that uses modern auth which does not seem to have had the issue.

Yes... When I did that 2 days ago, the error prompt amount and frequency reduced drastically as I posted in my previous comments. I was still getting the sporadic error prompts. In the last 2 days, I gather enough data points the prompts were triggered as a result of me doing something to my emails. I generally have a habit of reading and email then move it to a folder. The move action and delete action is triggering the prompts. I am using the latest GMail for Android app and connecting to eas.outlook.com.

Still happening for me. It was less frequent earlier but now back to what it was like before the issue was “resolved”

Unfortunately i've still got the issue. Enabled 2 step authentication but when trying to add my account back to office 2016 professional i'm still unable to log in, with both app password or my regular password. Windows credentials pops up and keeps asking to reenter but no success nop matter how many times until i cancel at which point it fails.

I'm using Gmail for android, using eas (exchange account) to a personal outlook.com address (which doesn't support modern auth, so using app password).

Gmail app supports modern auth for outlook.com addresses if you use the second option.