User experience considerations for MFA sign-in.
Once a user has setup two-factor authentication, their sign-in process will be different from the standard sign-in flow. This guide will walk you through the adjustments you need to make to support this in your application.
At the very least, assuming the user has enrolled in one method (e.g. SMS/Text message) you should present the user with a new screen for the extra verification step after they have entered their username and password.
Try signing in with any credentials.
If the user has enrolled in multiple methods, consider including both methods in the verification step after they have entered their username and password. Following what we discussed in the enrollment guide, consider presenting the user with their primary method first as well as letting them switch.
Try changing the verification method.