Embarrassed to admit I can't remember which Nostr-related subscription this is for.
nostr:nprofile1qqstwmttqq0md5t92uvslk037ecnz4tw6sdlwr9gjdxk5uas5xks3mqxj09t3
Discussion
No info on its profile page.
Guess I'll just have to wait and see what breaks.
I believe this is spam/scam. I got the same message a while ago without having any NOSTR related subscriptions.