Apologies for the delay here! I believe you may have posted in the wrong section. For all questions relating to our monday apps framework and our API, you can post it to the “monday Apps & Developers” section. This is where our Developer Success team will be monitoring new posts.
Are you still experiencing an issue with your request? In general, you can find more specific errors relating to your OAuth tunnel in the URL.
Let me know! Happy to continue digging into this with you.