Can't trigger OnEvent()

Hi guys,
First time working with PUN.

Soo, I'm stuck on an event call.
I really don't know why and I'm using most of the code from this tutorial on the Photon Site:
https://doc.photonengine.com/en-us/pun/current/tutorials/oculusavatarsdk


public void OnJoinedRoom()
{
Debug.Log("OnJoinedRoom succesful");
int viewId = PhotonNetwork.AllocateViewID();

PhotonNetwork.RaiseEvent(InstantiateVrAvatarEventCode, viewId, true, new RaiseEventOptions() { CachingOption = EventCaching.AddToRoomCache, Receivers = ReceiverGroup.All });
}

private void OnEvent(byte eventcode, object content, int senderid)
{
Debug.Log ("Eureka..");
if (eventcode == InstantiateVrAvatarEventCode)
{
[...]


I'm getting the first Log but It never outputs the second one.

I hope you can help me and feel free to ask if something's unclear

Cheers,
Jawah