Members 2 Pro bbPress Add-on

On my localhost, I am building a site where I want all member activity to be on a subsite to keep the main site clean of member only stuff.

On this subsite, I have activated M2, Support System, and bbPress.

When in M2 >Settings >Add-ons the bbPress Integration is grayed out and can't be activated.

Activate bbPress to use this Add-on

Now bbPress is activated on the same subsite as M2, M2 seems not to be able to connect with bbPress as bbPress isn't network activated in network admin like M2 and will not be as it's not planned to offer bbPress to users on other subsites.

Is there a solution to make this work?

Regards
Dennis