HTC VIVE Pro on HP Zbook G6 extra monitor.

[VREGA]

Hello,

I'm using the Zbook als workstation for my HTC VIVE Pro. The RTX5000 is more than equiped for this. It is connected through the mini displayport.
Now we are trying to add an extra monitor through HDMI. This is so we can see what is happening in the VR.
When i connect the monitor with HDMI the HTC Vive pro stops working. When i disconnect the HDMI it gives signal in VR again.

Anybody got an idea how we can solve this?
Greats Lars