My non renewing subscriptions got rejected as I move from subscription to one time payment model. It says "In order to approve your new In-App Purchase business model, we have to verify the purchasability of the items being sold. Please upload a new binary and make sure that your new In-App Purchase products are available for purchase at the time of review."
But the thing is I uploaded to new builds since then and both got approved and live but this error is still stuck. Submit for review is greyed out.