@metkraming I did discover I got this email:
Please link more social media channels(to your Musicoin profile) which can show us how involved you were in the past with music content creation, we need to see some active history of your musical work. When you finish with linking please send an email at email@example.com in order to be verified faster.
But like I said, I have a small handful of sites linked. Do I need more? Isn't that I don't have enough songs up? I don't have enough plays on them? Or activity recently enough? Or the reviewer just doesn't think the music is good enough?