Thunderbolt Video Issues

[mousewife]

I have two external monitors (one is mine and one supplied by my employer) that I use with my work provided laptop with no issue. One is connected via HDMI the other via what I assume is a HDMI to USB-C (although it is plugged into a thunderbolt port) cable. If I try to use my own laptop, only the HDMI one works, and I'm struggling to work out why. I've narrowed it down to the port I think but I'm reaching the limits of my knowledge. Device Manager tells me however that the Thunderbolt port is working correctly.My laptop is an Alienware M15 R6 with Win10. Offending monitor is a cheap AOC one.

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