Can't seem to make any sense of.... Erazer beast 25x

[fr4nk1sh]

which port or what cable etc i need to get/use to get Variable Refresh Rate to work over hdmi compatible display. (display only has hdmi)

It say's on the speec sheet that my laptop Medion erazer beast 25x has hdmi 2.1 port which im using with a brand new 2.1 cable.
why can't i get it to work, do i need to connect via the usb-c port?

ps: i tried to toggle the option on and off on the monitor aswell.