@NOLABILL
RayCue HDMI/USB connector is the killer definitely it is not compatible either way. I till can't work out why you have to " using a HDMI cable connected to my tablet". Do you mean tablet is your Surface ?
Your Surface has miniDP port and your monitor has DP 1.2 and HDMI ports all you need is
(a) a simple miniDP to DP cable or
(b) a simple miniDP to HDMI .
There are many around for example
(a) https://www.jbhifi.com.au/products/alogic-mini-displayport-to-displayport-cable-4k-support-male-3m
(b) https://www.cablechick.com.au/cables/1m-mini-displayport-to-hdmi-cable-male-to-male-thunderbolt-sock...
Regards.
BH***
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