Outlook 2016 doesn't accept password or app password

MS people are trying to mislead us or they don't know better.... and hope people don't catch the details. OAuth is supported in several versions of Outlook - it's not new. The screen you showed indicate you are logging into a work or organization account, hence the outlook.office365.com domain and you are showing Bearer*. This means your account should be properly authenticated.

If this was a consumer account, i.e. Hotmail, Outlook.com, Live or MSN mail, then the OAuth will not happen. To me, it's not Outlook itself that is missing the OAuth related code, but the server side is rejecting OAuth like an account is not provisioned for that.

The MS people here kept saying OAuth is supported on the consumer accounts, but then they stop short of saying what protocol. If you read through all the posts (ironically, I used Copilot to read it for me just to make sure), OAuth is only supported on IMAP protocol on the consumer accounts - that's only thing they confirmed. All of us are dealing with Exchange/EAS/EWS issues and I am nearly certain those protocols on the consumer accounts are not provisioned with OAuth or at least not universally to all accounts.

The end game is to force people to buy Office 2021 for those hardcore users... or force people to use free "new Outlook", so MS can intercept and collect all of your non-MS data. It's more of a strategy that they laid out to force our hands. Your best option is to move your data off MS systems if you have privacy concerns.

If I look through the entire history of this thread and MS' feedback, here is my takeaway:

1. Basic Auth is going a way, BUT NOT YET
2. The current denial is related to Basic Auth
3. MS implemented some security measures in 1/2024 because of brute force attack, so the server will now block Basic Auth if it senses "irregularity" in access pattern.

But until Basic Auth is completely and officially removed, can we have some access reliability? I am sure many folks including myself have already spent way too much time debugging this. We just need a period of normalcy. MS needs to fix/improve the new security measures, so it doesn't falsely block legitimate login attempts. This will give us time to address the "missing/non-working" OAuth needed for EWS/EAS.

I have the same issue, a couple days ago everything stopped syncing with Office 365, my desktop Microsoft Outlook Client, as well as my phone Outlook Client (using 9Folders). Nothing can authenticate or contact the server to send/receive emails.

I also tried to reset the app on my phone, deleted all the data and setup again - with no solution, now everything is gone off my phone and I cannot setup to resync (contacts, emails, tasks, etc.)

Microsoft please HELP quickly as this is crippling!!!

... also had the problem within the last 2 days?

Regards

I've same issue, i'm using Office 2016 and it's not accept the password or app password. I'll use Mail App for temp solution but i hope they can solve the issue