Solved!
Added this code to the bottom of my ‘page’ template, as that appears to be the default page for bbpress:
if (is_bbpress()) {
get_sidebar(forum);
} ?>
et voila.
Ah, I looked at the HTML and suspicions confirmed — it is not a page, but instead is classed as “forum-archive.” I think that means I can’t just change the template (obviously, as that is not working!). But I’m not sure what to do as my default pages have a custom sidebar that seems to prevent the bbpress sidebar from showing up on the Community/forum page.
Thanks, that’s pretty much what I had done — except I gave my sidebar a different name. It’s registered; it shows up on my widget page; I put the bbpress items in my new sidebar; I edited the php file to give it the proper i.d.; I called it from the community.php template. Still defaulting to the regular page sidebar.
What seems to be happening is that it doesn’t recognize the template I’m choosing for my Community page. It will only read the default template. Is that a thing with bbPress?
um, that header should have been “custom theme”