Add username root attribute to a profile

How can I add username root attribute to a user profile? The user was created when the Requires username in the connection/database/settings was switched off.

It doesn’t look like you can add a username root attribute after the user has already been registered without one. I am getting an ‘operation not supported’ error. Are you doing to this to a whole set of users?

Yes to all my already registered users

And you plan on adding a default username? or a programmatic username?

A unique uuid4() for each user.

Why not use app_metadata to store it?

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I was hoping for a way to modify the root attributes but seems this is not possible. yes that is a possible solution. Thank you

You could migrate the users to a new auth0 DB with their usernames