I cannot post any topics or reply to comments in General Discussion forum despite having active sub

As the title says.
I have no idea why I am unable to post on the General Discussions forum. I’ve tried in the past and there either was no REPLY button present or my + NEW TOPIC button for General Discussion was deactivated.

And you’ve tried logging out and back in to refresh any cookies, I assume, because it should be the first thing that is tried when there are problems like that with ANY forums.