1 · Your numbers
Codes forward to your active number. Travelling? Add another number and switch which one is active.
2 · Subscribed numbers
Tick a number to receive every MFA code that arrives on it. Codes can't be split per account — one number, one stream.
3 · Add an account to a number
New Microsoft 365 login from a customer? Record it against a number, then register that number as its MFA method at
mysignins.microsoft.com.
Courier