The Time-Saving Function Key F1 to F12 are used to perform specific tasks quickly.

in combination with the keys in the top row of the keyboard (F1 F12).

But a number of users report After installing the windows 10 update Function keys not working on Laptop.

Uninstall/Reinstall the Keyboard Drivers

After the restart, check windows automatically detect the keyboard driver.

Again restart windows and on the next login check, the function keys working properly.

Disable Filter Keys

Filter Keys is a Windows feature designed to block repeated keystrokes.

Although its actually quite unlikely this feature will block the function keys on your keyboard, its possible.

we recommend temporarily disable this feature and check it may help.

Change options on Mobility Center

Windows Mobility Center is there by default on most laptops.