Hi Calvin,
The error you see indicates that the service worker is not responding to the queries from the background or foreground page. The browser may have some other logs, also in the development console there is a way to re-activate it again.
I'm guessing that the safest policy may have some restrictions on the service worker. If you find more information, please add it into the ticket.
> Is this a configuration error on my side?
I don't think so, it should work without any additional configuration. I will check that and report back on the ticket.