Go to Settings > Gaming > Game Mode and turn it off, as it can sometimes suppress system hotkeys. System Settings & Drivers Alt Tab is not working like it used to. - Microsoft Learn
Test the right-side Alt key + Tab . If it works, your left Alt key might be physically damaged or "swapped" with the Windows key via a firmware setting (often fixed by pressing Fn + Esc on some keyboards). alt tab not working in windows 11
: 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. Go to Settings > Gaming > Game Mode
If the problem persists, the registry key handling the Alt + Tab switcher might be corrupted. alt tab not working in windows 11