Your Microsoft 365 sign-in uses a second check, usually the Microsoft Authenticator app on your phone. When you change phones, move it before you wipe the old one.
You still have your old phone
- Install Microsoft Authenticator on your new phone.
- On a computer, go to My Sign-Ins and sign in (approve it on your old phone).
- Choose Add sign-in method, then Authenticator app, and follow the steps with your new phone.
- Check you can sign in with the new phone, then delete the old phone from the list.
You’ve lost or reset your old phone
You won’t be able to approve sign-ins. Raise a request or call us on 0204 502 1288. We’ll check it’s really you, then reset your sign-in methods so you can set up the new phone.
Good to know
Never approve a sign-in you didn’t start. If your phone asks out of the blue, press Deny and let us know: someone may have your password.