Can't get the forums to work on Subdomain site


I have Buddypress installed on the primary domain. I am trying all the different options, but I can’t get the forums to appear on the subdomain site. I can see it in superadmin, but not as an admin.

Do I need to install bbpress separately on the subdomain site? Is it that the forums in Buddypress only work on the primary domain?

Anyone have an idea what could be wrong?