I've had that happen to
When I install it (on GrapheneOS) as a PWA and go to the "login with bunker URL" screen and paste a (newly-created) bunker from Amber, it just spins forever and I never get the Amber request. Tried the relays at nsec.app and also nos.lol.
Has anyone had this work? nostr:npub1syjmjy0dp62dhccq3g97fr87tngvpvzey08llyt6ul58m2zqpzps9wf6wl ?