lg 27gl850-B limited to 60Hz

I have this monitor for the last 3 years and have run it earlier at 100Hz. Today connected my laptop after some time and to my surprise the 100Hz option is missing. I am using the same cable that came with the box. My laptops HDMI port is outputting 4k at 60Hz so it definitely is capable of 1440p 100Hz. Switching of freesync allows the refresh rate to be increased to 75Hz.
What could be the reason for this? How do I get to 100Hz back?
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I am currently using a laptop with i7 12650h and rtx 3070ti.
I have searched all the forums and tried everything out. Also as I said, I previously have used this monitor at 1440p 100 Hz with the same cable.
Any help would be appreciated.
Thanks
 
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