How to I get the post to regcognize XML

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ASP.NET-Core

I am trying to receive str it can be json or xml. the following code the post accepts the json but when I post xml the post is null. the get sends xml or json and the post accepts the json it is is the accepting xml that is the issue

[Route("api/[controller]")]
    public class CancelController : Controller
    {
        [HttpGet("get.{format}"), FormatFilter]
        public IEnumerable<BatchData> Get()
        {
            List<BatchData> cancel = new List<BatchData>
                {
                    new BatchData { BatchNumber = "1"},
                    new BatchData { BatchNumber = "2"}
                };
            return cancel;
        }

        [HttpPost("post.{format}"), FormatFilter]
        public BatchData Post([FromBody] BatchData cancel)
        {
            if (ModelState.IsValid)
            {
                return cancel;
            }
            else
            {
                return cancel;
            }
        }
}

What I have tried:

I am not sure what else to try like I said it works for json in the post but when I send xml the cancel is null
there is no error just doesn't recieve the data
this is the data I am submitting as raw in postman
<batchdata><batchnumber>1234