nostr:npub13kwjkaunpmj5aslyd7hhwnwaqswmknj25dddglqztzz29pkavhaq25wg2a I use Alby with both Damus and Amethyst. Damus never fails, Amethyst most of the times either fails silently, or displays a message pointing at recipient's problem - something like 'I can't fetch the invoice'. Managed to zap with Amethyst maybe a couple of times. In my case it might be that Amethyst don't have necessary permissions (can't store or process the invoice). I couldn't figure out exactly what that is. IDK, but will try to find that out.
Also Alby recently stopped to sign up new users. To get an account you need an invitation. I sometimes use Zeus to access Alby and recently the service has been failing a bit.
Summing it up it needs some more tests to say 💯% where the problem is in my case.