Are you encountering this error specifically during or while launching the single-player campaign ?
your profile. Restart the game and relink the profile if needed. Verify Game Files : Right-click the game in your library, go to Properties Installed Files , and click Verify integrity of game files Toggle Steam Overlay : Some users fixed the error by the Steam Overlay, while others found success by it. Test both states. Disable Mods age of empires 2 definitive edition tampering detected fixed
Any software that draws an overlay over your game or injects code into it can trigger this error. Are you encountering this error specifically during or