Thank you for your feedback! . Our product team is working on this feature and currently We can't commit GA to this request at this point in time.
Here you have a use case related to what you need
https://github.com/azure-ad-b2c/samples/tree/master/policies/custom-mfa-totp and for sign-in Please refer https://github.com/azure-ad-b2c/samples/tree/master/policies/sign-in-with-authenticator
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