Publish Offer API returns http status 500 in sandbox enviroment

[be-656865]

I want to publish item in sandbox enviroment, but Publish Offer API failed due to status code 500.

Details of the error is following, but I don't have an idea where is wrong because it's ambiguous.

Does anyone have an idea why this error occurs?

{

    "errors": [

        {

            "errorId": 2003,

            "domain": "ACCESS",

            "category": "APPLICATION",

            "message": "Internal error",

            "longMessage": "There was a problem with an eBay internal system or process. Contact eBay developer support for assistance",

            "parameters": [

                {

                    "name": "code",

                    "value": "415"

                }

            ]

        }

    ]

}

I referred to followings for Process of listing item.

https://stackoverflow.com/questions/63853430/how-to-create-listing-in-ebay-sandbox
https://developer.ebay.com/api-docs/sell/inventory/resources/offer/methods/updateOffer