It looks like the App in question is not inside a Team Folder?
If it’s in a personal folder, you can probably move it into any Team Folder that’s on a Pro Plan or above, and then you’d be able to get support. If it’s currently on a paid plan, you would need to cancel the plan before it can be moved.
I just realised that I still have access to your Team, and now I see what’s going on. You are clicking in the wrong place. Click the Support link as shown below. After you’ve selected the App, a new page will open and you should see a button on that page to open a ticket.