Accept x-www-form-urlencoded in Web API .NET Core

Try using [FromForm] instead of [FromBody].

public IActionResult Post([FromForm] PlayerPackage playerPackage)

• FromBody > Bind from JSON

• FromForm > Bind from Form parameters

You can also remove [FromBody] altogether and trial it then. Because you are expecting form-urlencoded should tell it to bind to object.

This did the trick for me:

[HttpPost]
[Consumes("application/x-www-form-urlencoded")]
public IActionResult Post([FromForm]IFormCollection value)

For PlayerPackage, the request should send a PlayerPackage Json Object, based on your description, you could not control the request which is posted from other place.

For the request, its type is application/x-www-form-urlencoded， it will send data with {"status":"incomplete","score":""} in string Format instead of Json object. If you want to accept {"status":"incomplete","score":""}, I suggest you change the method like below, and then conver the string to Object by Newtonsoft.Json

[HttpPost]
[Route("~/api/trackAllInOne/set")]
[Consumes("application/x-www-form-urlencoded")]
public IActionResult Post([FromForm] string data)
{
    PlayerPackage playerPackage = JsonConvert.DeserializeObject<PlayerPackage>(data);
    return Json(data);
}