Please learn how to make Magento Attributes available for the selection in M2E Pro.
If you’ve just installed M2E Pro to your Magento, you need to go through the Initial Configuration to link Channel accounts
Our Development Team has provided the relevant improvements to make M2E Pro and major Magento update — Multi Source Inventory (MSI) — compatible.
This issue is called double synchronization which often leads to the incorrect product data update on the channel.
This problem may have two reasons:
1. Your product is already in the other listing. There's a...