can you activate the 120fps with the monitor asus tuf vg249q 144hz in xbox series s?

the series consoles are fussy on monitors, 144hz but must support 120 also. but the majority of games wont run 120fps only a select few on the s. also get a monitor with freesync as that will help when frames drop alot which they will.

No as you need a newer console

Xbox series x

If you mean 144hz then yes you can use 120-144hz thru vvr and Vsync and as long as your monitor supports it via hdmi 2.0

The game will never run at 120fps with your current hardware

No it runs at 60fps

Series s doesn't run at 120fps

You are thinking of 1440p at 144hz Vvr with Ray tracing off

Only ps5 (same hardware on digital or disk)

And Xbox series x

The TUF Gaming VG27AQ 27-inch monitor is one of the impressive builds from the ASUS line-up. It has a native refresh rate of 144Hz and a maximum refresh rate of 165Hz. The device is powered by FreeSync and is G-Sync (NVIDIA Certified) compatible. The device offers a maximum resolution of 2560 x 1440 and offers wider viewing angles.

even in the manual it stated adaptive sync which is usually both, the reason they are showing with gsync is that its on the nvidia approved list, but apparently it has all.

also some people chatting about how to set it up for series x

(5) Asus TUF VG27AQ with XBOX Series X 1440p 120hz with VRR ON : Monitors (reddit.com)

As noted from the above, it is not listed as working with the Series X, so will be the same with the Series S

It's difficult to find an exact answer on this one as I can only find limited information on that monitor. A lot of monitors have a lower native refresh rate and then boost it to 144Hz using the Variable Refresh rate (VRR)....this is fine for a PC where it can adjust accordingly. The Xbox is different as, to run 120Hz, the monitor needs a specific 120Hz setting...if it's using VRR to go over 100Hz, then it won't have that exact setting.

To add to that, most monitors need a DisplayPort connection to reach 144Hz and that isn't possible with the Xbox (only has HDMI)

You could always contact Asus to double check:

https://www.asus.com/uk/ASUS_Website_Information/Contact-ASUS/

That is the contact details for the UK so you may need to change the region to display local details if you aren't in the UK (the bit is in the bottom right of the page)