static Dictionary<string, IRemoteControl> RemoteControlMapping = new();

[HttpPost("remote-control/create")]
public IActionResult CreateRemoteControl(string userToken)
{
  if (RemoteControlMapping.TryGet(userToken, out var _))
  {
    // handle if it already exists?
  }

  RemoteControlMapping[userToken] = new RemoteControl();
  return OK();
}

static Dictionary<string, IRemoteControl> RemoteControlMapping = new();

[HttpPost("remote-control/create")]
public IActionResult CreateRemoteControl(string userToken)
{
  if (RemoteControlMapping.TryGet(userToken, out var _))
  {
    // handle if it already exists?
  }

  RemoteControlMapping[userToken] = new RemoteControl();
  return OK();
}