No sound ingame.
Intro videos have sound but once at the splash screen no sound at all. No sound in menu's, no sound when during the prologue cutscene, no sound during prologue gameplay.
I've updating video drivers, added "-nohmd" to the launch options, rebooted at least a dozen times, verified the game cache multiple times, run as admin (first just the game then both Steam and the game), tried Win 7 compatibility mode, disabled all other audio devices in Sound Control Panel, set speaker setup to 2.0 and 5.1, and set sound to 16-bit and 24-bit. I uninstalled and reinstalled UE4PrereqSetup_x64.exe as recommended in the improperly tagged thread on this issue. That didn't help either. I even tried setting the audio output device to my Vive Pro headset (which was turned off/disconnected during all other testing) and still no sound. As a last ditch effort I updated Windows 10 form 1803 to 1809 but still no sound.
Windows 10 1809
i7 920 @3.85ghz
24GB Ram DDR3 1600
Nvidia 1070 (connected to audio receiver via HDMI)