Content update call api error

We had a working plugin for uploading apk/aab to the store, but some time ago it broke. Have you rolled out some kind of update or have there been changes in the API?
The session and file upload are successful, but at the /seller/contentUpdate stage we receive an error.

Failed request: url -,  
 code - 403,  
 body - {"from":"seller","body":{"ctntId":"00000NNNNNNN","contentStatus":"UNDER_TEST_CONFIRMATION","httpStatus":"FORBIDDEN","errorCode":"4111","errorMsg":"Content type is not valid"}, 
"message":"Request failed with status code 403"}

Can you open a developer support request for this issue.

I believe the Store API changed a bit last year and they should be able to help you with this.

Samsung Developer Relations