Watch the video:
Timestamps:
0:00 - Explanation
0:10 - Game in Admin? Is Steam?
0:22 - Check Steam Overlay is enabled (and hotkey)
0:46 - Check Steam Overlay for game
1:02 - Check other overlays, and conflicting programs
1:21 - Verify game files
Want to play games but can’t open the Steam Overlay using Shift+Tab? This video shows you a couple of reasons that this could not be working and how to fix them. By the end, you should be able to chat, Google and more while playing Steam games again!