Forum Discussion
Outlook - Second 365 account-different tenant- fails after both MFA activated
I have asked them and haven't heard back about that. Since I was unable to powershell into them(my other post in a different section of this community site), I couldn't check myself.
I have shut off 2-factor for my account with them in the meantime.
They currently use Dirsync with their on-prem AD and have told me that they all had to use an app password for their Outlook with 2-factor on. I guess that answers that so I will try 2-factor again and use an app password instead.
I suppose they will be able to use modern auth once they get AD Connect and MFA Server going with passthough authentication. But Dirsync was just a more simple sync so I still don't know why modern auth wouldn't work for them, or why it works for roughly the first day, then fails completely - and iphone mail still works modern auth for that tenant. Who knows.
Cecil C. Achord Did you ever find a resolution to this? I too am having a very similar problem once adding enabling MFA on another email address within Outlook from a different Tenant. Once I set it up it initially looked to be working but I noticed a few hours later all of the users that shows their MFA as "Enforced" they could not access their email. I would prompt them for their password but they'd never get logged in. They did report that it was working fine on their cell phones though.
