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Amazon Seller Central - Troubleshooting

Written by Ilya Zinoviev

Updated on Sep 11, 2026

While configuring your Amazon Seller Central connection, you may encounter several issues. Understanding these common errors can help streamline the setup process and facilitate quick resolutions.

Authentication error "Client authentication failed"

This error means Improvado could not authenticate to Amazon for this connection. It is not something you clear by rotating a key on your side: an Amazon Seller Central connection stores only the authorization you granted when you connected it, and no secret of yours is part of it.

There are two causes. Either Improvado’s access to your selling account was revoked in Amazon Seller Central, or the problem is on Improvado’s side, with the application credentials Amazon issues to us.

Solution

Check whether Improvado is still authorized in your Amazon Seller Central account. If the authorization was revoked, re-connect the data source. If it is still in place, nothing on your side will clear the error — raise a request via the Service Desk.

Duplicated records in "orders_by_order_date" report

Duplicate records may appear in the orders_by_order_date report. The reason for this issue is that one order can be handled in several warehouses, which leads to duplicate records.

Note
If none of the provided solutions worked, feel free to raise a request via the Service Desk

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