can not add a simple youtube channel link in an artists page

I try to update the youtube link in the artists site of paula fuga, but I always end up with a dead link. I tried the official link youtube provides to share, I tried the @ handle, the @ handle without the @ and several other versions. Also as recommended to just include the artists name is leading nowhere. I tried to compare to other channels, but youtubes linking seems to be a mess. What am I missing?

if this has been asked before I am sorry, I did not find a specific forum keyword search.