If such a case has occurred, you will find current log entries in your system:

1. First, open the menu under Data > Log .
2. Filter your search by selecting the following log under Integration:
   Plenty\Modules\Otto\Item\Commands\MarketplaceStatusImportCommand

Such a log entry indicates a rejection:
 

3. Open the entry and display the details.

You can search here using your variant ID, MOIN or SKU.