[platform-error]Seller is blocked or suspended from selling in the target marketplace.
This usually happens when Amazon seller central account is deactivated due to non-payment of subscription or some other reason at seller. As a result, 4Seller couldn't send this order to Amazon FBA for its fulfillment.
1、Please check and review under Amazon FBA if MCF orders can be created there or not. With current issue you should not be allowed to create orders there too. So, you must reach out to Amazon seller support team now to resolve the issue for you.
2、Once re-activated you can re-authorize the connection between 4Seller and Amazon FBA too.