Gear VR won't "Lock to HMD"

Development Rendering
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1

the problem:

“Is Head Mounted Display Enabled” seems to always return false on samsung Gear VR.
so the camera is not locked to the HMD and it will use the default camera’s not the ones for hmd.
the checkboxes under the camera settings are checked.

how to reproduce:
(osig and nvpack is already
installed)

  1. create a clean Top Down blueprint
    template “Mobile/Tablet”, “Scalable
    3D or 2D”, “No Starter Content”
  2. enable the plugins “Gear VR” and the
    “Oculus Library” and disable all
    other in the VR section.
  3. in the project settings configure
    for andriod, set the minimum and
    target SDK version to 19, turn on
    “configure the android minifest.xml
    for deployment for gear vr”.
  4. package the project for “Android
    ETC2”.

hardware:

Samsung Galaxy S7 Edge (SM-G935F)

Gear VR (SM-R322)

software:

Android 6.0.1

UnrealEngine 4.12