Thanks for reporting will fix
nostr:npub1v5ufyh4lkeslgxxcclg8f0hzazhaw7rsrhvfquxzm2fk64c72hps45n0v5 nostr:npub1unmftuzmkpdjxyj4en8r63cm34uuvjn9hnxqz3nz6fls7l5jzzfqtvd0j2 I’m unable to comment on tracks from the fountain web app when logged in with Nostr. I tried commenting on https://fountain.fm/track/oAX9GGUIdmV6i3MdizPR
Here’s the error in the dev console

Discussion
Would be awesome to zap from the web app as well.
Also, you can easily drop in nostr-login to enable nip-46 login on the web app. It acts as if you have a nip-07 extension if you login with nip-46 with that.
Here’s an example of a simple web app I use it on