[_ck_]

If you can get to “/forums/bb-admin/” (replace forums with whatever you called it) it might be your cookies.

You need to make sure your cookies are all pointing to the root of your website for both bbpress and wordpress. By default they are not so it’s probably preventing login?

See here:

https://bbpress.org/forums/topic/wordpressbbpress-single-sign-on?replies=22#post-9010

and

https://bbpress.org/forums/topic/cookie-integration-for-wordpress?replies=3#post-6496

and a few other threads if you search for “cookies”