That most likely means that your device can not receive data push messages and notifications as is.
If you run graphene os, you'd need to enable play services to make it work.
Discussion
This is it. I run another privacy roriented OS relying on microG. I will check that.
Going for freedom tech is not always easy. But well, I did chose consciously freedom over comfort !
Some os allow to run play services in separate jail / compartment, but not sure about privacy implications.
To at least try nwc on minibits, there is a fallback websocket connection, that should receive nwc commands while app is foregrounded. Could be used to "taste" nwc with connection added to nostr client on another device (not much tested)