question

I'm testing UploadUserData-request
The manual says the body data should look something like this:

{
  "Data": {
    "Class": "Fighter",
    "Gender": "Female",
    "Icon": "Guard 3",
    "Theme": "Colorful"
  },
  "Permission": "Public"
}

I am using my own custom API for GameMaker and try the request with identical body I get a response:

{
    "code": 400,
    "status": "BadRequest",
    "error": "InvalidParams",
    "errorCode": 1000,
    "errorMessage": "Invalid input parameters",
    "errorDetails": {
        "Data": [
            "The value for key Class was not valid JSON."
        ]
    }
}

I expected that the problem would be with my API but I tested the same with Postman and got identical results (also tried to switch to UpdateUserPublisherData with the same result)

The weird thing is that if I send only real values instead of strings everything works perfectly and values update in game manager. Also if I send non-escaped JSON as a value I get the same success message, but nothing updates in backend.

Also changing user had no effect.

EDIT: After a bit of testing I found out this only happens on one of my games "568C" but not on other ones.

Feel free to fiddle with the game profile with corresponding title id, it's just a test game.