When you change phones you have to reset your MFA. Put in helpdesk ticket asking to clear all old MFA.
Then you will need to delete any Time Mfg account already listed in the MS Auth app - by clicking into it - then hitting gear on right corner - the remove account.
then use this link to get the QR to add new setup for new phone: Entra ID MFA link: https://aka.ms/mfasetup