Dmc Devil May Cry Steam Must Be Running To Play This High Quality

A common culprit is permission levels. If Steam is running as a standard user but your game shortcut is set to "Run as Administrator," Windows may see them as separate sessions, breaking the communication link.

: The game may lack the administrative rights required to communicate with Steam. Dmc Devil May Cry Steam Must Be Running To Play This

Once this is done, try launching the game again. A common culprit is permission levels