Bummer, this may not end well. Your BIOS date is 06/01/2022, so it may not have good touchpad drivers yet. But we can still try a little more... maybe something will click for you. But you may be stuck using an external mouse for awhile.
MX-23 AHS version has
an even newer kernel available (6.5) than what you're using. I'm not sure how to include it in a live USB, but it might be worth trying. This was added to the AHS repo just a week ago, so I don't think it would have been in the ISO you tried yesterday.
A very basic question, but I gotta ask: Are you sure your touchpad is enabled? Open the Cinnamon start menu, start typing "mouse" and select "Mouse and Touchpad." Then click on the Touchpad tab. Then just below the tab, it should say, "Touchpad is....
Enabled." (Don't use "Disabled when a mouse is attached" while troubleshooting.) I've never seen this setting not be enabled though so I don't have much hope, but it's still basic troubleshooting to check it.
Going along with the above... check if you have a function key (F6?) that disables the mouse/touchpad. It can be pretty easy to activate F-key functions by mistake.
More basic troubleshooting: dig through all of your BIOS/UEFI settings for any options related to your touchpad. Also update your BIOS, if there is an update available.
Check
dmesg for any reports related to your touchpad. If this command below doesn't show any results, look though the full
dmesg output (without "| grep elan") for any clues that may help.
Code:
sudo dmesg -T | grep -i elan
(The -T option gives
dmesg output in human date/time format. The
grep -i option reports upper/lower case.)