Apple Mail on iOS15 / Outlook.com MFA Application pwd

I too had this problem recently after updating to IOS 15.2 on my iPad and iPhone. Both devices had trouble verifying my personal Outlook account from Settings > Mail > Accounts. I have verified that I entered the right password since I could login to my Outlook from browser just fine.

I too have tried deleting, rebooting, and adding the account back (by adding Outlook.com). This did not work at all, as I encountered the same issue (unable to verify my account)

The fix: The only resolution for me to is to add “Exchange” rather than “Outlook.com”. This method worked well and I was able to login, sync my mails, reminders, notes, etc. Give it a try and hopefully it will fix your connection issue.

It may be caused by iCloud+ Private Relay. Go to Settings -> iCloud Account -> iCloud and turn "Private Relay (Beta)" to "Off".

You will need to login again once per device after disabling the iCloud+ Private Relay on each device.

I have removed the accounts entirely from the phone and added them again.

when promoted to log in , I have used the Microsoft login that pops up.

after that the accounts worked perfectly. Its been more than a week without a single issue.

i hope this works for you too

After 24 hours, iOS 15.1 update appears to have fixed this issue for me as well. Accessing via several devices and various exchange based email servers including gsuite accounts using app passwords all of which previously prompted at least daily to re-enter password.

Yes, after the iOS/iPadOS 15.1 update, the problem seems to have been patched in the mail application. It only prompted once after the update, but never again all day today. Looks like we were able to bring enough attention to the problem.

I think I found the problem. It’s not the Mailor Outlook apps it’s Contacts, go to Settings - Contacts - Accounts - click each exchange account and you’ll see on top Account not authenticated. Re-enter password should fix the problem

I MAY have found the issue. It has been almost 24 hours since I changed it and I haven’t received the pop up telling me that my Exchange password is incorrect. Go to iCloud.com in Safari and check your time zone setting. Mine was set to Pacific which is INCORRECT and must have gotten changed during the iOS 15 update. I set it to the correct Eastern time zone and no pop up so far in the last 22 hours. It’s worth a try and needs to be corrected anyway if it is wrong like mine was. See screenshot.

Forget waiting for Apple to fix it.

download the Outlook for IOS app and set it up for your account. Don't forget to delete the native mail app or (at least the exchange account from it) so you do not get prompted for the password from THAT app.

The Outlook for IOS app is "different" but you get used to it and it works perfectly.

This is what I did and have not had any issue in days.

Do not know if this will work for everyone but try. Go to accounts tap on email account that keeps popping up, tap on email password. Backspace until you delete password,renter password and check marks will appear beside everything. Press vol-up and then vol-down and hold power button until phone resets. This fix my problem good luck.

On my iphone 8 the automatic reply was stuck in “loading” mode. Go into Setting> mail> accounts> , then open the mail account that you keep getting a request to enter your pw for. On my phone the automatic reply on the bottom of the screen was stuck in “loading”. Enter your pw again and then hit the > to open it, i turned the automatic reply on and then off again, cos I wanted it off, and now the requests for the pw have stopped. I went on to my iPad to do the same thing, but when I went got to the last steps the two synced. Hope this works for you.

You need to delete the account, reboot, and then setup once again….Really anoying, but faster than wait for Apple to fix

The problem is associated with the hotmail email configuration. I deleted the account and then rebooted the iphone. Then went into mail and setup hotmail again. Problem is now solved.

I deleted and reconfigured my outlook account and the problem appears to be resolved.

I had this exact same problem and had to re-enter my password daily. I updated to 15.1 and the bug appears to have been corrected

The latest update 15.1 seems to have corrected this issue. I am no longer forced to re-authenticate my account on a daily basis