tl;dr: changed mobile phone, azure authenticator app doesn't work in Teams guest organizations. Looking for a way to reset my MFA options there.
I'm struggling with the following situation for a couple of days already.
At the same time, I'm a guest in several of my customers' Teams organizations. I'm always signing in with [firstname.lastname@example.org](mailto:email@example.com) and switch organizations manually (in Teams, upper right corner). In most of them I had to enable MFA as well and I was able to login perfectly fine. Everything ok until here.
Now, a couple of days back I got my new phone and tried to "migrate" my Azure Authenticator accounts. While I was able to import them again, I have to walk through the setup for each account manually. All those accounts are named slightly different in my authenticator app, such as user_organization#EXT#CustomerTenantName. And I have no clue how I can initiate the MFA process for those accounts again. According to my customers, they have not enforced MFA for guest accounts, so I'm a bit lost at this point.
My only workaround is to sign in using a text-message code, but that's an additional step I'd like to get rid of. I'm looking for a way to re-configure the MFA settings for my account in guest organizations. And I'm not able to find a way to do so.
Any help is highly appreciated..