Error when trying to subscribe to peertube instance

I have a mastodon instance and a peer tube instance that both seem to be working great except that I’m trying to subscribe to a user’s channel on the peer tube instance (censorproof.tv) and I get a message that says “Unfortunately, there was an error looking up the remote account”. When I try to look up and subscribe to the user from the search box on the mastodon instance i get a different error message that says “503 remote data could not be fetched”. It sounds like something is wrong on the peer tube instance since I can subscribe to users on other mastodon instances just fine. How can I find out and what do you suspect it is?
Thanks

Well it’s most certainly a Peertube issue, so the answer will not be here, maybe try Follow Peertube user from Mastodon hosted on the same server - PeerTube - Framacolibri