ARMeshManager unable to acces XR.ARFoundation

[AlmarvDiessen]

I am trying to create meshes from a real table.

I have tried using the ARMeshManagers as described in the Spatial Mesh Example scene
but ending up at the warning
if (activeSubsystem == null) { Debug.LogWarning($"No active {typeof(XRMeshSubsystem).FullName} is available. Please ensure that a valid loader configuration exists in the XR project settings and that meshing is supported."); }

I cant figure out how to fix that problem. I have tried:

• updating AR foundation to v. 5.1.0-pre10 mixing it with Meta OpenXR feature (found out that meshing is not supported in that.
• searching how to even enable a valid loader or the correct configuration exits
• researching if even meshing is even supported on Meta quest pro.

What I am trying to do is to have a simple bal bounce of a created mesh of a real world table
FYI/disclaimer I just started getting into XR this monday. Any guidance and help is very much appreciated!

Update:
Digging around in ARMeshManager.cs I found out the XRMeshSubsystem is not recognized from the ARfoundation Package. is there anyway to fix this by reimporting or anthing?