Xbox One X unable to do 1440p @120hz on VIOTEK GNV32DB

That doesnt answer the question is it going to work for older monitors that are hdmi 2.0 that didn't run at the 1440p 120hz they were supposed to run at on xbox one x i bought a viotek monitor gft27db was supposed to run 1440p 120hz over the hdmi 2.0 but
it doesn't on the one x only runs at 1080p 120hz with freesync on or 1440p 60hz no freesync will series x solve this issue thats what he wants to know i have heard it was a bandwidth issue but with the new console having higher bandwidth i would guess it would
solve the issue but would like to know for sure

That monitor supports 120hz ONLY at 1080p, and 60hz at 1440p according to the companies website. That would be why you cant select 120hz at 1440p

"With our monitors, you can run 120Hz at 1080p resolution. Or you can rock a pixel-perfect 1440p resolution at a 60Hz refresh rate. Even knowing this, you’re now able to enjoy buttery smooth gameplay
on one of the most popular game consoles of all time — thanks to FreeSync support"

From viotek website

Many thanks for your response but I'm afraid you are mistaken. HDMI 2.0 has always supported 1440p at 120hz. Even the article you sent says this.

"The HDMI 2.0 connector was previously featured on Xbox One X and Xbox One S, with bandwidth limitations locking content to 4K resolution at 60Hz, or 1440p at 120Hz"

So my question remains How do I get 1440p at 120Hz on the xbox series X with the huawei mateview gt34 monitor that is capable of supporing this?

You will need the Xbox Series X for 4K 120hz. The Series S can only do 1440p 120hz

The Xbox One X supports 120hz only at 1440p and 1080p resolutions. It does not support 120hz at 4k. So unless your TV or monitor supports 1440p resolution (many don't), you will only get 1080p when selecting 120hz.