Just did a logcat. I get the OculusId but it still shows up as grey avatar. Not the personalized one.
Did you ever get this working? I have a very similar tale. I can pass my entitlement check, successfully get the user ID for my avatar, instantiate an avatar, apply the ID to the avatar, and still see the same old avatar.
This was before the availability of the new avatars. So not related to this.
But honestly I did not try this again for quite a long time. Maybe they fixed it, but I don't think so.