Although Membership Pro is coordinated with CB, and CB with Kunena, it seems that Kunena doesn't work with Membership Pro.
As Administrator, I have all the acces rights, but I can't create a new Kunena topic.
I ask the same question to Kunena developers.
Thanks for your answer,
I don't think this is related to Membership Pro as all. This is something with permission settings in Kunena, I believe. So hopefully, you will get answers from Kunena developers for this question (this is not controlled by Membership Pro but by Kunena extension)