The YouTube channel URL on the profile page does not seem to work properly.

I'm able to use this format to access my old YouTube channel, but not the new one.

I think it's because my main channel is newer and doesn't have a "username" to use with this legacy format. https://support.google.com/youtube/answer/6180214?hl=en

Since YouTube has begun phasing out this URL format, it may need updated to the /channel/ instead of /user/ or else users with newer YouTube accounts will not be able to add YouTube URLs to their profile.

Switching it will break everyone's existing URLs though, so I'm not sure what the solution should be.