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HoloLens Spectator View: Cannot trigger Hololens' camera with iPhone

I'm using the HoloToolkit spectator view (preview), i did everything following the instruction, but when i run the app on both hololens and iPhone, the camera on HoloLens won't be triggered. I feel that iPhone did not even send a ping message to HoloLens since i got the error: (I'm using HoloToolkit 2017.4.3.0, Unity 2017.4.20f2 LTS)

2019-02-15 16:32:05.508713-0500 SpectatorView[11478:6313086] [si_destination_compare] send failed: Invalid argument
2019-02-15 16:32:05.508755-0500 SpectatorView[11478:6313086] [si_destination_compare] send failed: Undefined error: 0
2019-02-15 16:32:05.508775-0500 SpectatorView[11478:6313086] [si_destination_compare] send failed: Invalid argument
StartAsClient Discovery listening
UnityEngine.Networking.NetworkDiscovery:StartAsClient()
HoloToolkit.Unity.Preview.SpectatorView.SpectatorViewNetworkDiscovery:ManualStart()

(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)

StartAsServer Discovery broadcasting
UnityEngine.Networking.NetworkDiscovery:StartAsServer()
HoloToolkit.Unity.Preview.SpectatorView.NewDeviceDiscovery:ManualStart()

(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)

DontDestroyOnLoad only work for root GameObjects or components on root GameObjects.
UnityEngine.Networking.NetworkDiscovery:StartAsServer()
HoloToolkit.Unity.Preview.SpectatorView.NewDeviceDiscovery:ManualStart()

Can someone help me out here?

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