Thank you, I submitted an appeal and got a nice clear answer, which I followed and my app is now approved and live in the store. TL;DR I added "for GoPro" as a suffix to my app name, and removed the trademark from the subtitle.

Same issue for me. However, when I click on the Keys tab it says I have to ask permission to access the App Store Connect API, I did that and I got a "Generate API Key" button and it made me one. I think the doc pages are out of date.

Same exact problem. Lost previous pairing somehow, cannot re-pair. Click Pair button, enter PIN, see a brief message "setting up devicename" then goes back to the "pair" screen.