Auth0 authed native app and PCKE

I have an iOS/swift app that uses Lock.swift (classic) to auth users for access to the app. Once the user is authed, the app needs to access an API on their behalf. I’m confused by the PCKE workflow as the user have already been authed by Auth0. Is there a way to get a access_token for my API without bouncing them to another login page?

Having multiple audiences would solve my problem, but that seems not to be possible. Simply, I want to be able to access a users profile from Auth0 and my API without having to auth the user twice. Is this not possible?