Thank you for confirming your products are correctly set to the right status. Based on the thread thus far, it also sounds like you have conducting other necessary troubleshooting steps shared.
In that case Google has still determined these should not be marked as custom products for one reason or another, and connecting with them is absolutely imperative as per my first reply.
Have you reached out to their support team to appeal the decision yet, @fairydustdecals ?
I look forward to your reply,