Setting Render Texture for Single Pass Instanced Camera

I'm trying to get a render texture setup for a single pass instanced camera using its target texture property. Currently only the left eye is rendering out to the render texture and the right eye is rendering completely transparent. I create this render texture through the following code:

Code (CSharp):

1.     _targetTexture = new RenderTexture(_childCamera.pixelWidth,_childCamera.pixelHeight, 24, RenderTextureFormat.ARGB32);
2.     _targetTexture.dimension = UnityEngine.Rendering.TextureDimension.Tex2DArray;
3.     _targetTexture.anisoLevel = 0;
4.     _targetTexture.antiAliasing = 2;
5.     _targetTexture.volumeDepth = 2;
6.     _targetTexture.vrUsage = VRTextureUsage.TwoEyes;
7.     _targetTexture.Create();

I also created a custom shader to check this render texture, I setup the shader following the instructions provided here. In my frag function I can check both sides of the render texture by changing the stereoEyeIndex value from 0.0 (for left) to 1.0 (to right).

Code (CSharp):

1. UNITY_DECLARE_TEX2DARRAY(_MainTex);
2.  
3. fixed4 frag (v2f i) : SV_Target
4. {
5.     UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
6.  
7.     float stereoEyeIndex = 0.0;
8.     fixed4 col = UNITY_SAMPLE_TEX2DARRAY(_MainTex, float3(i.uv, stereoEyeIndex));
9.     return col;
10. }

Note that I am aware of the UNITY_SAMPLE_SCREENSPACE_TEXTURE method however for control purposes I decided to use UNITY_SAMPLE_TEX2DARRAY.