Microsoft MFA What if I changed my phone? What if I changed my phone number? What if I changed my phone and phone number? What if I have to reinstall Microsoft Authenticator on my phone? What if I need to add an extra phone? Can we use the passwordless option in MFA? What if I don’t have a phone or don’t want to use the mobile application? How can I change my default authentication method? Why my authentication method does not work for my VPN Connection?