even if Manage Magento Stock is set to "NO" for FBA order, there should be at least 1 item in your QTY for successful order creation. M2E Pro just passes order details and it is Magento functionality to create orders. Without QTY it is not possible to create the order. That is why the item will be reserved and M2E Pro will release (compensate) it later.
This will leave FBA orders without a Magento order created.
Randy Bruce Rubinstein
shared this idea
December 10, 2020