Switching from 2D to VR Google Cardboard

I'm currently switching to VR mode on mobile (android, google cardboard) using this script

     public void Switch()
     {
         StartCoroutine("SwitchToVR");
     }
 
     IEnumerator SwitchToVR()
     {
         // Device names are lowercase, as returned by `XRSettings.supportedDevices`.
         string desiredDevice = "cardboard";
 
         // Some VR Devices do not support reloading when already active, see
         // https://docs.unity3d.com/ScriptReference/XR.XRSettings.LoadDeviceByName.html
         if (String.Compare(XRSettings.loadedDeviceName, desiredDevice, true) != 0)
         {
             XRSettings.LoadDeviceByName(desiredDevice);
 
             // Must wait one frame after calling `XRSettings.LoadDeviceByName()`.
             yield return null;
         }
 
         // Now it's ok to enable VR mode.
         XRGeneralSettings.Instance.Manager.InitializeLoader();
         XRLoader xrLoader = XRGeneralSettings.Instance.Manager.activeLoader;
         xrLoader.GetLoadedSubsystem<XRDisplaySubsystem>().Start();
         //I'm pretty sure this is deprecated but like it's here anyways :)
         XRSettings.enabled = true;
     }

However when I try to switch to VR mode I get this error

 AndroidPlayer(ADB@127.0.0.1:34999) NullReferenceException: Object reference not set to an instance of an object.
 at EnableVR+<SwitchToVR>d__1.MoveNext () [0x00000] in <00000000000000000000000000000000>:0
 at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00000] in <00000000000000000000000000000000>:0
 
 (Filename: currently not available on il2cpp Line: -1)

The line (Filename: currently not available on il2cpp Line: -1) to me suggests its an issue with il2cpp, if so it may be a Unity issue, however I thought I'd post here just in case I'm missing something.