144hz Monitor doesn't Support 120hz mode

I have a 144hz monitor that I use a lot for my pc gaming.
Fast forward to today, my Xbox series s arrives in the mail. I at first set it up on my TV and think to myself, "why not try it with my monitor?" I set it up with the monitor I research it and find that Hdmi 1.4 (my monitor's HDMI Port) can do 120hz.
With my graphics card I use dual link dvi so hdmi was a new territory for me. I go to select the 120hz mode on my Xbox and it doesn't work.
I tried researching it but I can't find anything because my monitor is pretty old-but hey- 144hz 1ms response time is good no matter how old it is.
My question is, is there a way I can use the 120hz mode without needing to purchase a new monitor?
My monitor is Asus VG278HV

:)