Step-up authentication with Swift universal login

I’m looking for documentation or guidance on how to implement step-up authentication with universal login. I am currently using the auth0 swift sdk webAuth with certain scopes, but would like to obtain a step-up token with additional scopes after the user is signed in.

I am able to get the token using another call using webauth, but the safari window appears and then disappears. It would be nice to make this call without the window appearing and then disappearing immediately. But I’m also not sure if this is the best way to obtain a stepped-up token.

Thank you.