It’s a simple spec so it’s hard to imagine how it could go wrong in implementation. I don’t have an android device handy, and only going off secondhand evidence from my (skilled) cpp contractor trying to build 42 into strfry.
If it requires any amount of UI to enable on amethyst, then perhaps we missed something, but our very sketchy initial tests indeed failed with our NIP-42 ref machine running nostr-rs-relay.