For whatever reason, nothing in the Support and Feedback section of the forums are showing up in the Recent Discussions page.
This was actually an intentional change requested by the Ingress product team. They want to avoid overwhelming other gameplay-related conversations with the very active Portal Appeals subcategory. Thanks for surfacing!
@NianticCasey Unfortunately, there is no other way check those forums for new posts/disucssion other than to manually open each one, which is incredibly tedious. Can't there be an option to re-enable those posts back into the Recent Discussion feed?