Problem with Xbox One X at 1440p/120hz

I would look into your monitor and call DELL not Microsoft. I also have a One X and have never had any problems, as soon as select 120hz it automatically drops me down from 4K to 1440p. You must be misunderstanding something about your monitor as there
must be a defect of some sort or your monitor does not support 1440p at 120hz.

For reference, before responding I booted on both my One X's. One is connected to a Samsung 4K QLED and I had no problem switching from 4k 60 to 1440p 120. My other X is connected via an LG 4K monitor and again when selecting 1440p OR 120hz it automatically
selects 1440p or 120hz without any issues.

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.

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're a little discombobulated there.

I can display 1440p ONLY at 144Hz, and cannot at 120Hz on Xbox. I can only display 1440p at 60Hz on Xbox one X.

Yes I can display 1440p at 60Hz with Freesync - Although 120Hz without Freesync would still technically be better but unfortunately that is not possible with the restrictions on Xbox one X.

I use 1440p @ 60Hz settings with Freesync and HDR with 32 bit color. I get a pretty damn good picture but I'm just a little upset I can't use the 120Hz feature.

It sounds like any monitor that uses non standard Vesa frequencies (144hz as opposed to 120hz) will not be able to effectively run at 120hz with 1440p on xbox one x.