Thank you for contacting ScanPower support. The issue is coming from Amazon. Your account has been blocked and is not permitting us access. You are likely getting a lengthy error message, something like this - but specific to your MerchantID (where the XXXXX is below):
Amazon message: encryptedMerchantCustomerId: XXXXX is unable to inbound. Reason: Seller is blocked by the AndonCordManager. - This operation may be partially successful, Please check the status. Reason: encryptedMerchantCustomerId: XXXXX is unable to inbound. Reason: Seller is blocked by the AndonCordManager.Request Id: YYYYYY
To resolve this, you need to contact Seller Central support and give them the text of the error message you are getting.
Please let me know if you need anything further.