Hello @Nicola Swan, @Renno East, @Michael7140hz, @PhilChaney-5005, @BrianBear, @Fedeles, Catalin,
Multiple customers reported this issue through support tickets. We worked closely with our engineering team to address the behavior, and a fix has now been released. I tested this in my tenant and can confirm that when an authenticator administrator user checks a user's authentication methods, the phone number method now appears under "Usable authentication methods."
I request you to test this again and let me know if the issue persists. If so, I will follow up with our PG team for further investigation.