i am German i try my best to explain in english so , when i tried to start my Overwatch today it said ‘‘There was an Error while starting Overwatch (0xE01200D0)’’ i already tried to reinstall it but that didnt helped and i tried to repair but that didnt helped me either .
Would you be able to post the contents of your DxDiag report? If you have BullGuard installed, you may want to try uninstalling it, at least temporarily, or disabling the firewall protection as this has been causing similar issues for players.
Oh well Turning BullGuard off helped thank you 