I had the same issue on a Lenovo Legion I5 10th gen. Tried all the suggestions online and nothing worked. Updated Bios, reinstalled drivers, turned touchpad on and off in windows settings and changing the touchpad setting in Lenovo Vantage - nothing seemed to work and so I gave up and assumed it was a Windows 11 or hardware fault and I just had to use a mouse.
Eventually I happened to look at the logos on the function keys and noticed one looked like a trackpad with a diagonal line through it which was on the F10 key on my laptop.
I tried holding down Fn and pressing F10 and immediately the touchpad began working again!!!
My cat sometimes walked on the keyboard and must have turned off the trackpad, doh!
Hope someone finds this of use.
Regards,
Gibberfish