I had an issue where sound in overwatch stopped working. I tried what I could find online, generally resetting game settings, doing a scan and repair, etc. Updated my audio drivers, checked the menu for volume per application in windows 10. Then I tried PTR, and sound worked in PTR. Was about to fully uninstall and re-install, but I had a feeling it was windows screwing around. The way I fixed it in the end, was to RENAME the overwatch executable to Overwatch2.exe and Overwatch Launcher2.exe. Fixed it right away. I'm sure its a stupid Windows issue which I'll fix later.. anyway for now. Its working!