I decided to revisit this thread after having issues with my hdmi port and usb-c out,, using a different monitor than before (dell p2714t) since i still haven't able to get back to my apartment ~~ i updated drivers through AMD and still no dice.
RMAing this laptop is not possible as I need it for university. The fact that this works occasionally for myself and the numerous others on this thread implies that there is some underlying software issue in the flow x13,, not a hardware issue.
@Blake_ASUS please try to work this out with whatever software developer resources you have access to as this is clearly a more widespread problem and just asking people for their serial numbers and the model of their monitors every time they have this issue is clearly not helping anyone.