Cannot access my account after code from Authenticator App does not work after I change my mobile

Hi, sorry you are stuck in that loop. If this is a work or school account, the fastest path is usually another Global Admin or Authentication Administrator in the tenant resetting your MFA methods from Entra ID. If you are the only admin, you will likely need Microsoft account recovery or Azure support to verify ownership, because nobody in the community can safely disable MFA for a tenant account. Once you regain access, it is worth creating at least two break-glass admin accounts with separate MFA methods so this does not happen again.