C# ,Windows Service authorization, loosing token from header when making a request

When I try to make an authorization with .net windows service I get 404 Unauthorized, supposing because of the missing token, had the same problem when was doing the request from Postman, solution was to check this Follow Authorization header from settings, how can I reproduce that in c# code this are my methods:

private string GeToken()
{
    var client = new RestClient("url");

    var restRequest = new RestRequest();
    restRequest.AddParameter("grant_type", "grant_type");
    restRequest.AddParameter("client_id", "client_id");
    restRequest.AddParameter("client_secret", "cliend_secred");
    restRequest.AddParameter("username", "username");
    restRequest.AddParameter("password", "password");
    restRequest.Method = Method.POST;
    var token = "Bearer " + (string)JObject.Parse(client.Execute(restRequest).Content).SelectToken("access_token");
    return token;
}

The token is getting right every time,

public void GetSoapResponse()
{
    var requestUrl = "url";
    var client = new RestClient(requestUrl);
    var request = new RestRequest(Method.GET);
    request.AddHeader("Authorization", GeToken());
    IRestResponse soapModel = client.Execute(request);
}

Here in soapModel, I get 404 Unauthorized