
Admin Mobile App
Like many we were caught out with this MFA issue and find it difficult to understand the poor communication and duration it took to fix. Found a way around it using the Office365 admin Mobile app, sorry late in the day to be posting a work-around.
The app still functioned and remained logged in unaffected by the MFA issue for user admin/email tasks including creating new users. We created a new user and assigned Admin role, it is not possible to enable or disable MFA in the app. This is fine as once user created we could log in with the new Admin and turn off MFA for the existing Admins.
Although a bit slow, the Admin app is quite handy for lots of things and got us out of a hole yesterday.