If you cannot tap on your laptop's touchpad, but the physical left and right click buttons are working properly, the Tap to click option might be disabled.
To access the Tap to click option:
Start -> Control Panel -> Mouse -> Device Settings -> Settings -> Tapping -> check Enable tapping and apply the changes
System Preferences -> Trackpad -> Point & Click -> check the box next to Tap to click
Note: If this option was already enabled, disable it and re-enable it again.
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