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I have this problem - Outlook 2016 doesn't accept password or app password - and i think it is a growing World wide Microsoft problem :-(
See also here: https://www.reddit.com/r/Outlook/comments/19dx64p/outlook_2013_windows_10_suddenly_not_accepting/Outlook gives me this: (startede yesterday)
I have 2 PC's with HOTMAIL accounts in Outlook 2016 ...
They both have this error.
I do get mails ... but I can´t send mails. Yesterday it did work for 1-2 hours ... but right now the error is there all the time :-(
Please help me.
Thanks in advance
Pierre
Using classic Outlook for Windows in business environments
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
@John N 999,
Thanks for the update that OAuth is helping. I am getting direct feedback from some users with 9Folders and Apple Mail having issues and sharing that to the service team. These apps connect with EAS and the service team is aware of and continues to investigate.
A quick update from my end - It's been working normally for about 3 hours now. Earlier in the day it's still behaving erratically, randomly prompting for password even when the status showed "connected to MS Exchange"
(Outlook 2013, Windows 10 PC, 2FA + app password)
Thunderbird, using OAuth2.0 has not thrown an error message as of late, so perhaps that piece of the fix is working, at least for me, and hopefully others. The email client 9Folders was still throwing authentication errors as of this afternoon.
@thegreger,
The only users that will see ads are those using the free version of New Outlook. If you have a paid Office Subscription you will not get ads.
@Robdstef,
If you have M365 Personal the best experience would be to use the M365 Outlook that is part of your subscription. It connects with modern auth and is not affected by this recent issue. If you prefer Thunderbird, it would be best to follow the guidance of Thunderbird to use OAuth as noted in this article, Microsoft OAuth Authentication and Thunderbird in 2024 | Thunderbird Help (mozilla.org). I will keep sharing feedback to the service team to work on addressing the issues with basic auth, but you could skip all that with the other two options you have. Modern auth is also a more secure connection method so worth the effort to switch if you can.