Retrieve phoneMethods for existing users

Question

Hi,

This is related to the beta version of authentication/phoneMethods

I can add a phone authentication to a user and then retrieve it using 'https://graph.microsoft.com/beta/users/xxxxxxxxxxxx/authentication/phoneMethods'

But when i try to retrieve the phone methods from a user that has added the phone number directly during the signup flow process I get this
{
"@odata.context": "https://graph.microsoft.com/beta/$metadata#users('xxxxxxxxxxxx')/authentication/phoneMethods",
"value": []
}

Does this have something to do that is still in beta or I'm I missing something?

Thank you