Forum Discussion
Outlook - Second 365 account-different tenant- fails after both MFA activated
So I have admin accounts for two companies. A main account which my machine is all setup with and our new parent company account. After turning on MFA for both accounts, my Outlook stopped liking t...
Is Modern authentication (and MAPI/HTTP) enabled in that second account's tenant?
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.
