Forum Discussion
How to register a second and a third mobile phone for MFA?
How do I register a second and a third device (iPhone / iPad in in this particular case)? First phone (main phone) is already using the Authenticator App without problem. Now we need to regi...
There are a few solutions:
- Authenticator Instances: create multiple Authenticator app instances for the account in question. Multiple MFA apps will end up being registered for the same account while supplying a code on all the devices added, giving you a backup.
- Harware based authentication methods: while not technically a cellphone these will give you alternative devices that can be used for authentication such as FIDO2 security key, a RFID tag or external smart card readers.
- Multi-User Authenticator apps: You can add a Multi-User Athenticator app as the MFA method which can allow multiple devices to be registered for MFA. This can be done with standalone Multi-User Authenticators such as Salepager or as part of a password manager many of which increasingly embed this feature.
- Condition Access policies: this is a workaround that can be used to designate particular devices as excluded from MFA requirements as a means of providing a backup device to login.