Outlook 2016 doesn't accept password or app password

Me and the wife are having the same issue.

I use BlackBerry Hub on Android, started prompting at the start of the week. Managed to get it going using different server URLs for a short time, e.g. outlook.com, outlook.office365.com, hotmail.com, microsoft.com with varying degrees of success. Outlook.live.com seemed to work for a few hours then got the same error.

Wife just uses native iOS mail client and is also prompted for password.

Utter shambles, considering moving away from Microsoft for mail. Wasn't keen on Google but at least I wasn't stuck without mail on my phone for a week.

Issue it still ongoing. I had it almost go away but... and thing is on PC which did not connect to exchange after whole thing started and it should have all passwords stored shows same "ask for password loop" though one i entered it and it looked like it working was just next to it. So it more puzzling than just server side and issue is still ongoing as this morning. And the thing is Outlook does receive e-mails but still asked for passwords.

Me and the wife are having the same issue.

I use BlackBerry Hub on Android, started prompting at the start of the week. Managed to get it going using different server URLs for a short time, e.g. outlook.com, outlook.office365.com, hotmail.com, microsoft.com with varying degrees of success. Outlook.live.com seemed to work for a few hours then got the same error.

Wife just uses native iOS mail client and is also prompted for password.

I also experienced a period of time (yesterday?) where the issue seemed to have abated but it had not and returned as bad as before.

Utter shambles, considering moving away from Microsoft for mail. Wasn't keen on Google but at least I wasn't stuck without mail on my phone for a week.

Where misery loves company you may appreciate this. Recently "cut the cable" and committed several accounts to Outlook over Gmail. That being said, If this is just an untoward outage than I'm not so worried because those have been rare. I can still use email on the many affected devices, platforms, and configurations, (which is most of them) and The Outlook android app seems to experience no errors so that's the My last backup option, which I've not needed yet.

Issue it still ongoing. I had it almost go away but...

There was about half a day where, for all of my devices, it was not occurring nearly as much or at all but the issue was still there and got worse and more prevalent again.

Outlook does receive e-mails but still asked for passwords.

Indeed, that occurred on my devices in some tests as well. Navigating folders, the action of which AFAIK sends it's own authentication request, may behave differently that a manual send receive.

This is a problem with third party email clients as well. All imap settings are being rejected.