: Search for and open the On-Screen Keyboard from the Start menu. Press your physical Alt and Tab keys to see if they light up on the screen.
If system files are corrupted, built-in features will break. alt tab not working in windows 11
This complexity is the culprit. The more visual layers you add to a 30-year-old keyboard shortcut, the more likely it is to trip over its own shoelaces. : Search for and open the On-Screen Keyboard