Way to use oculus avatars with VRTK in Unity, mobile compatible. https://forums.oculusvr.com/developer/discussion/73121/cross-platform-avatar-hands-not-activating

AvatarCustomDriverOpenVR.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using VRTK;
using UnityEngine.XR;
using Oculus.Avatar;
using Photon.Pun;

public class AvatarCustomDriverOpenVR : OvrAvatarDriver
{
    void Awake()
    {
    }
 
    private void Start()
    {

#if UNITY_ANDROID

        try
        {
        GameObject reference = VRTK_DeviceFinder.GetControllerLeftHand();
            if (reference) {

        reference.GetComponent<VRTK_Pointer>().enabled = false;
        reference.GetComponent<VRTK_UIPointer>().enabled = false;
       if(reference.GetComponent<InputSwitcherUI>()!=null) reference.GetComponent<InputSwitcherUI>().enabled = false;
            }
        }
        catch (Exception e) {
            Debug.LogException(e);
        }
       
#endif
    }
   
    
    float voiceAmplitude = 0.0f;
    ControllerPose GetControllerPose()
    {
        ovrAvatarButton buttons = 0;
        ovrAvatarTouch touches = 0;
        return new ControllerPose
        {
            buttons = buttons,
            touches = touches,
            joystickPosition = Vector3.zero,
            indexTrigger = 0,
            handTrigger = 0,
            isActive = true,
        };
    }
 
    private void CalculateCurrentPose()
    {
        Vector3 headPos = UnityEngine.XR.InputTracking.GetLocalPosition(UnityEngine.XR.XRNode.CenterEye);

        CurrentPose = new PoseFrame
        {
            voiceAmplitude = voiceAmplitude,
            headPosition = headPos,

            headRotation = UnityEngine.XR.InputTracking.GetLocalRotation(UnityEngine.XR.XRNode.CenterEye),
          
            handLeftPosition = UnityEngine.XR.InputTracking.GetLocalPosition(UnityEngine.XR.XRNode.LeftHand),
            handLeftRotation = UnityEngine.XR.InputTracking.GetLocalRotation(UnityEngine.XR.XRNode.LeftHand),
            handRightPosition = UnityEngine.XR.InputTracking.GetLocalPosition(UnityEngine.XR.XRNode.RightHand),
            handRightRotation = UnityEngine.XR.InputTracking.GetLocalRotation(UnityEngine.XR.XRNode.RightHand),
            controllerLeftPose = GetControllerPose(),
            controllerRightPose = GetControllerPose(),

        };


    }
    public override void UpdateTransforms(IntPtr sdkAvatar)
    {
        CalculateCurrentPose();
        

        UpdateTransformsFromPose(sdkAvatar);
    }

}