Session management with service workers & firebase.auth.Auth.Persistence.SESSION

I've gotten session management with service workers to work as per [Session management with service workers](https://firebase.google.com/docs/auth/web/service-worker-sessions) and this [snippet](https://github.com/firebase/snippets-web/blob/81fcf30888909936d4898421e858da809f8cf595/auth/service-worker-sessions.js). I've also gotten Session persistence working. What I haven't been able to do is get both working at the same time. If I turn on session persistence (firebase.auth.Auth.Persistence.SESSION) with the FirebaseUI (web), bearer tokens are no longer passed. POC code is [here](https://github.com/maucaro/Concepto/tree/master/WebApp/wwwroot)