I have not been able to link Minibits either
Discussion
1. Create NWC connection, tap QR code icon and press Copy
2. Go to Amethyst
3. Long-press zap icon on any note
4. Tap Paste icon to paste NWC connection string from Minibits
6. Save
You need to have push notifications in nostr:npub1kvaln6tm0re4d99q9e4ma788wpvnw0jzkz595cljtfgwhldd75xsj9tkzv enabled and working for NWC integration to work when app is in the background or switched off.
Thanks!