XR Descriptor not found

Hi!

I'm trying to use the new ARMeshManager in AR Foundation, but when running the app on my Huawei P20, the component just disables itself. I found out, that this is because the MeshManager.GetSubsystemDesciptors() call doesn't find the required XRMeshSubsystemDescriptor.

I'm using Unity 2019.3.0.a11, and AR Foundation 2.1.3 with AR Subsystems 2.1.0. I've tried switching to the latest stable release of Unity (2019.2.2f1), but the issue was the same.

Finally, I've checked that all the other descriptors can be listed with MeshManager.GetAllSubsystemDesciptors(), as it can be seen here, except for the XRMeshSubsystemDescriptor:

Do you have any suggestions on what might cause this issue? Is it hardware related, or am I missing something?

I've tried this with a simple 3D project, where I deleted the original main camera, instantiated an AR Session and an AR Session Origin, and attached an empty GameObject to the AR Session Origin with an ARMeshManager component. Hardware-wise I'm using a Huawei P20, as I mentioned.