If the Alt-Tab keys combination is not functioning in Excel or other programs, make sure that your multitasking settings are correct. The Alt-Tab keyboard shortcut is not working on your computer due to incorrect system settings. What to do if you accidentally press Alt + Tab on PC?.What does it mean when Alt Tab is not working?.What’s the shortcut for Alt Tab on Windows 10?.Why are my Alt keys not working on Windows 10?.What to do when Alt Tab is not working?.Why is my right side Alt key not working?.Why my Alt key is not working in Excel?.How do I fix Windows key and Alt switch?.