Listings Items API, 4000000, An internal error has occurred

[zzj0124]

Hello,
API Call PUT /listings/2021-08-01/items/{sellerId}/{sku}, giving unclear error
{ "sku": "TC1YHN", "status": "INVALID", "submissionId": "c579d05aa83d4d4bbe86c3d49c474d40", "issues": [ { "code": "4000000", "message": "An internal error has occurred. Please try again.", "severity": "ERROR", "categories": [] } ] }

request uri: https://sellingpartnerapi-na.amazon.com/listings/2021-08-01/items/A2JG1055M1X6X9/TC1YHN?marketplaceIds=ATVPDKIKX0DER&includedData=issues&mode=VALIDATION_PREVIEW&issueLocale=en_US
x-amzn-RequestId:3afad9fb-22a5-4607-9225-4697df36d50e.

This problem has been going on for several days now.
But when I remove parameter mode=VALIDATION_PREVIEW, it can be successfully called.

[weilinggu]

Hi @zzj0124,

Please open a support case following the guidance here to deep dive the issue you are encountering.
Please ensure you provide the information you shared here in your support case.

Thanks
Weiling
Amazon Selling Partner Services