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According to MSI Optix G24C4 – Redefine eSports rules | eSports Gaming Monitor | MSI your monitor has (2) HDMI 1.4b ports. According to HDMI Specification 1.4b, HDMI 1.4b supports up to 120Hz at 1080p, but your monitor's specs page says it will do HDMI: 1920 x 1080 (Up to 144Hz). The problem here is that, while HDMI had the bandwidth to run 1080p @ 144Hz since v1.3, it's not a standard requirement for HDMI to support that mode, so your milage in practice will vary. Here's an interesting read https://www.reddit.com/r/buildapc/comments/8wyg4e . How did you determine that the "HDMI port is hard connected to the iGPU"? Is this a laptop with HDMI only and no DP?

You may want to try a different high speed HDMI cable.
 

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Cables do go bad, even when they seem to "work" just fine. See if the Intel graphics control panel let's you set a custom resolution and refresh rate. Wiring the HDMI output to the dGPU isn't necessary because either graphics card automatically outputs to that port when they take over the graphics task at hand, unless your laptop's specs specifically states that the HDMI port is exclusively drivable by the iGPU. I haven't yet seen such a case on laptops with hybrid/switchable graphics.
 

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There is in fact a refresh rate setting on the monitor, and in its manual under the Appendix A-4 page, there is a table for Preset Display Modes that lists FHD @ 120Hz and 144Hz. It could be the monitor is currently using the FHD 120Hz preset mode.
 
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