DUO Azure AD Sync supported phone attributes

Hello,
Does Duo Azure AD sync support any other phone attributes other than “mobilePhone” and “businessPhones”? Support stated that “IpPhone” should work but it doesn’t. Can someone confirm?

Did you set IpPhone as the source attribute for the primary or secondary phone in your Azure AD sync config?

If you visit the Microsoft Graph Explorer , do a query for users (or a specific user), and specify IpPhone attribute to retrieve does that return values for IpPhone? Like https://graph.microsoft.com/v1.0/users?$select=displayName,IpPhone.