Razer Ripsaw HD - Passthrough Output No Signal

Hi Team,

I recently purchased a Ripsaw HD from Razer eBay AU.
It detects fine in OBS and I am able to view the video and audio stream from a Nintendo Switch in OBS preview.
There is no passthrough signal from the output HDMI port however, I am using the included Razer HDMI cable for the output but it does not seem to passthrough a video signal.

I've tried different HDMI cables, a different screens, plugging in the included USB cable first, plugging in the HDMI cables first, nothing seems to enable HDMI passthrough output from the Ripsaw HD.

Main PC Specs:
AMD 3950X
RTX 2080 Ti
Windows 10 Pro
Synapse 3 updated. (Does not display as an attached device in Synapse 3)
Latest OBS release 27.1.3
Nvidia display drivers updated.

Also tested on a Razer Blade 14 (whilst charger is connected) in case it was related to the PC above:
AMD 5900HX
RTX 3080
Windows 10
Synpase 3 updated. (Does display as an attached device in Synapse 3)
Latest OBS release 27.1.3
Nvidia display drivers updated.

Screens tested:
TCL X925 65" TV HDMI 2.1 port
LG CX 65" TV HDMI 2.1 port
BenQ XL2420Z Monitor HDMI1.4 port

Screencap of working OBS preview:
https://imgur.com/seX7gbr

Any advice that you could provide is greatly appreciated. Whilst my usecase is to simply play using the preview window so that I may screenshare with friends on Discord, I do want to ensure that the unit is working appropriately, thanks in advance.