react-rxdb-offline-first tutorial still working?

[AntonOfTheWoods]

I am very new to offline and React and I am having several difficulties with this tutorial. I am able to login and see the app on localhost:3000 but if I try and refresh the page, then it loses this.idToken, tries to refresh the token and fails with a 400 error from auth0. My expectation is that if I had an error in my details it wouldn't log me in at all, though that may be wrong.

The serviceWorker is also not working - it definitely gets registered and I see "This web app is being served cache-first by a service worker. To learn more, visit https://bit.ly/CRA-PWA" but if I go offline and try and refresh, I get "no internet". Looking at the serviceWorker registration in Chrome devtools, I see a file that starts with

This service worker file is effectively a 'no-op' that will reset any
...

Which I tried to play around with in terms of setting NODE_ENV=production, etc. but it keeps getting compiled with this.
Has anyone got this tutorial to work in the last few months? Anyone else have any suggestions? Thanks!