Outlook 2016 doesn't accept password or app password

I have a separate but related problem

Until this Outlook 2016 problem started, I was successfully holding both outlook.com and gmail mail accounts in my local Outlook 2021 system on Windows 11. at the same time as the Outlook 2016 problem started, the system told me to renter my outlook.com account details, but it would not accept the login details (which were correct). I therefore deleted the outlook.com account from my local Outlook 2021 system, but now when I add it back again, the login details are accepted, but I cannot access any email or calendars on either my outlook.com account or my Gmail accounts. I get the error 0x80040111 and the message " The server is unavailable"

As soon as I delete the outlook.com account, everything starts to work again.

Has anyone else seen this problem?

I am using Mailbird on PC and Fair Email on Android. These clients are now working perfectly for me using standard settings.

Diego: it's working for you? or are you a Microsoft employee saying it's fixed. Mine too worked for hours yesterday and then intermittently did not. I'm just trying to understand if this is an official "resolution" or a user resolution. Thanks

It's resolved now! eas.outlook.com works with an app password from Gmail app!

Unfortunately i've still got the issue. Enabled 2 step authentication but when trying to add my account back to office 2016 professional i'm still unable to log in, with both app password or my regular password. Windows credentials pops up and keeps asking to reenter but no success nop matter how many times until i cancel at which point it fails.

I've managed to add the account back on outlook, credentials requested the password 5 times before finally syncing. I log in daily so will update if there's any further issues.