Outlook 2016 doesn't accept password or app password

It's not Nine. My wife and I use it too, Not one device will connect. Even deleted an act and now won't authenticate to add back in. My Windows 10 machine with Office 365 won't work with Outlook, but my Windows 11 will. Other apps on Android I have that connect to Outlook acts won't work either such as Tasks. Only app on Android that will work is Microsoft Outlook and ToDo, and their office 365 suite. Go figure. I know it's an "honest" mistake from Microsoft, but sure sounds like big brother Apple knocking out the competition... except as I said it affects Windows 10 also. Nine is very powerful and Microsoft should have bought it. Much better than Android Outlook and the HORRIBLE ToDo app for tasks.. Terrible app for sorting and filtering, and no universal view box.

Hard to believe it's taking so long to fix and no mention of it in the news.

yes this started to stop working since friday afternoon not receiving anymore new emails saying no connection retry for me and i'm using s20 they also email today and told me microsoft issue i'm currently using k9 mail not really a fan of it do you think this will be fixed by this week or what

i paid 9.99 after trial ended s7 phone and then after i got my s20 plus phone all i had to do install and everything was fine they also email me today saying that must be microsoft issue i even try to uninstall and reinstall yesterday it took awhile to load inbox and i went on computer check new mail waiting new mail to show up on app nothing it still saying no connection retry

so i'm not sure what is going on i despise using k9 email using as of now again do you think will be fixed by end of the week or what i really don't know nine email issue or microsoft issue

Yes, switching Thunderbird to OAuth worked for me also. Nothing working on 9Folders for Android though.

It seems much more than IMAP. Numerous server options rejecting.

Just adding my own experience. Thunderbird started acting up early in the week. Thought it might be related to MS and OAuth2.0 authentication, and it still might, but difficult to tell. Also using 9Folders email for Android, and experiencing periodic connection issues, more disconnection issues in actuality. Thinking 9Folders might be at fault, I reached out to them, and they responded quickly, providing information regarding MS being the cause here, stating MS is aware, and that they have their Outlook team on it.

Let's hope it's back by the beginning of the work week, otherwise, we'll really feel the pain.