Update Identity Provider Attributes... *especially* when I'm the IdP (database connection)?

Hi all, I have two connections atm, Azure AD and my local database connection. I can totally get behind not ultimately being able to update IdP attributes like family_name, given_name, email and such for any connections that are not my own but is there a way to update them for my database connection?

For example, at my database I have a last_name and we’ll say it’s ‘DeFino’ for a given user. When that user logs in Auth0 makes the user account and assigns it ‘DeFino’ for the last_name, however how can I change that? If I change it at my database, it’s never reflected in Auth0, and sending and Auth0 management request (via SDK) also doesn’t change it. I can easily add (and edit) any attribute I assign via user_metadata or app_metadata but that’s kinda silly to store everything there especially for fields that could be… duplicates per se.

I am using the PHP (Laravel) SDK if that matters at all.