Big hoarder might be failing because prod doesn't have the json package. Seeing if failure goes away if I change it back to the candidate server.

FunctionalTests/VR/CrossPlatform/Packages/manifest.json

@@ -36,5 +36,6 @@
     "com.unity.modules.vr": "1.0.0",
     "com.unity.modules.wind": "1.0.0",
     "com.unity.modules.xr": "1.0.0"
-  }
+  },
+  "registry": "https://artifactory.prd.cds.internal.unity3d.com/artifactory/api/npm/upm-candidates"
 }