Prepopulate Phone Numbers for MFA

As part of onboarding new users to our platform, we already have a user’s email address + phone number (sign ups are disabled). We are using the email address for passwordless login and then the phone number for 2FA.

By default, the Auth0 flow prompts for a user’s phone # as seen in the screenshot below:

Instead of prompting the user for their phone #, I am looking to pre-configure the phone number for a user based on what we already know. Is it possible to do this?

Prior to asking this question, I found an old thread on the topic (Multi factor authentication enrollment without prompting user for phone number?) but I couldn’t make it work and found it difficult to follow. Please let me know what I can do to make this work - thanks!