Unauthorized for Listings API

[DearRude]

I am trying to use the /listings/2021-08-01/items/{sellerId}/{sku} endpoint to get details on my items. I have successfully done so for ~7000 items in the Canadian marketplace and ~400 items in the United States marketplace.

However, when I am fetching information on about ~30 items in the United States marketplace, I get the following error:

Code: Unauthorized Message: Access to requested resource is denied.

Any idea how to troubleshoot this problem?

[chapmanjw]

@DearRude The most likely scenario is that the sellerId value being used doesn't match the authorized account. However, to investigate your specific requests further, can you please open a developer support ticket? https://developer.amazonservices.com/support Including the request details, timestamps, and request ids would help us to see what specifically happened on these requests.

[DearRude]

I think the specified sellerId is not recognized correctly since the id of two sellers I want fetch data from have the same seller id:
TopSelectCanada and QuickWare

I don't know how to distict them in the API call.