Hello Alex1178,
We are sorry to hear you are having issues with your Surface Laptop and it's trackpad not registering clicks! This is certainly not something we want you to experience!
There are a few questions, though, to help us narrow down what is going on. Can you tell us if this started after an update, installing an app, or any other factor that might coincide with the issue happening?
Running the Surface Diagnostic Toolkit was certainly a good thing to do, so thumbs up for that.
You may try removing the keyboard drivers and restarting. To do this, hold the Windows key on the keyboard and hit X. In the menu, select Device Manager. Once there, in the list expand Keyboards. You can safely select any you see there and hit the X at the top to remove it after selection. Once done, simply reboot and the drivers will re-install on their own. Test the trackpad and see if clicks are now being registered and lets us know!
Regards,
Tracy B.
Microsoft Surface Technical Support