There are multiple reasons your Authentication methods may need to change. Let's say you get a new phone and you need to set up Authenticator on it. Or you lost a device. Or maybe you are noticing some odd Authenticator behavior. Using a few clicks, you are able to review and edit your security information for your Microsoft 365 account.
From here you can
- Change your sign-in default method
- Add sign-in method
- Change or delete your phone number
- Change your password
- Delete un-needed or inaccurate authentication methods