QB Issue Resolution:

Invnetory is only reduced by one of two actions, a sale with that item listed, or an inventory adjustment.

So to sync amazon with QBDT inventory you need to import each sale by item.

or

get an excel sheet from amazon listing the items sold, and use something like transaction pro importer to convert the excel sheet to an iif formatted file for inventory sales. To this you would need a generic customer like “AZ Sales” and import the sale as a sales receipt.

iif formatted file can not do an inventory adjustment, nor build assembly items.

Resolution for Issue 'How to sync inventory from Amazon to QuickBooks Desktop?' available: Yes (Solved).
Source: Intuit Community forum.

How to sync inventory from Amazon to QuickBooks Desktop?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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