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Network error with Spectatorview from MRTK Unity between a Hololens and iPad

I've setup the sample project from MRTK-Unity version 2017.4.2.0
The Unity version that I'm using is 2017.4.12f1
I've followed the steps to install and get the corresponding dll files according to these steps:
https://github.com/Microsoft/MixedRealityToolkit/tree/master/SpectatorViewPlugin

I am able to export succesfully on both the Hololens and the iPad. But after I scan the QR code on the iPad with the Hololens i get an error message that I think is related to the Unity Networking (UNet) side and I have no idea how to fix it.
I can see the object both on the iPad and the Hololens on the correct position and changing colors. I've added the TapToPlace script to it to move the object, but these changes are not visible on the iPad. I think it is because it has lost the connection to the host, according to the error message.

So I'm only able to see the objects that are directly places in the scene and later changes are not coming through to the iPad. These are the errors i receive after connecting the iPad with the Hololens:

[ line 485] 
(Filename:  Line: 485)

host id out of bound id {-1} max id should be greater 0 and less than {2}
UnityEngine.Networking.NetworkDiscovery:Update()

[ line 541] 
(Filename:  Line: 541)

Spawn scene object not found for 3
UnityEngine.Networking.ClientScene:OnObjectSpawnScene(NetworkMessage)
UnityEngine.Networking.NetworkConnection:HandleReader(NetworkReader, Int32, Int32)
UnityEngine.Networking.NetworkClient:Update()
UnityEngine.Networking.NetworkClient:UpdateClients()
UnityEngine.Networking.NetworkIdentity:UNetStaticUpdate()

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

Spawn scene object not found for 3
UnityEngine.Networking.ClientScene:OnObjectSpawnScene(NetworkMessage)
UnityEngine.Networking.NetworkConnection:HandleReader(NetworkReader, Int32, Int32)
UnityEngine.Networking.NetworkClient:Update()
UnityEngine.Networking.NetworkClient:UpdateClients()
UnityEngine.Networking.NetworkIdentity:UNetStaticUpdate()

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