Hi Samuel,
If this is personal account then the MFA will require a reset so you can reconfigure the MFA on the app, if this is company managed you will have to request the Admin to reset the MFA for your account.
If personal you can call up supoprt desk on these numbers - https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
Hope this helps.
JS
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