MFA and email lockout
A person loses their phone while travelling. Their main email requires a code from that phone, and the same email controls recovery for banking, shopping and social accounts.
They cannot reach travel bookings, reset other accounts or confirm important messages. Recovery takes several days because no second method was prepared.
Current recovery details, saved backup codes and more than one approved sign in method provide another route back into the account.
If your phone disappeared tonight, which important account would you need first?
Where would you find a recovery code if your phone was unavailable?
Review recovery methods for the main email and other accounts that depend on it.