It has happened to me on several distros, and I don’t know how to get it to work. I have just installed EndeavourOS, and tap to click on touchpad doesn’t work. I have already installed libinput which seems to be an alternative driver to Synaptics, but it’s not working yet.
Did you go through the wiki? There is with libinput and or with xorg configuration plus a bunch of other stuff. I’m no expert on this as i am not a laptop user but just picked one up. So i might be joining the club.
I just did this on my laptop running eos and openbox. FIrst, run xinput list to get the id-number of your touchpad. Then run xinput list-props ID_NUMBER to see the properties of your touchpad. You’ll see tap to click or something to that effect listed, presumably set to 0. Note the property number in parentheses. Then run xinput set-prop ID_NUMBER PROP_NUMBER 1. That should do the trick as a one-off, but the question is how to make it permanent. I just have that line in my openbox/autostart and it works fine, but with gnome I assume you’ll need to put to put it in a script to run at login or some such. There’s probably an easier way, but this worked for me.