Can't get Netflix 5.1 Audio on Windows 8.1 App

All I get from Windows 8 Netflix App is PCM.

Troubleshooting:

Old Windows Media Center recorded TV show works.
- SPDIF out from GTX 960 works
- HDMI out from GTX 960 passthrough to TV SPDIF works

Netflix Windows 10 App on WinTablet works.
- HDMI out from Atom x5-Z8350 works

This site says it works for Windows 8 App. Is it true?
https://help.netflix.com/en/node/14163

I found the solution.

Under "Languages" for some odd reason, there's:

English (Stereo) <--- defaulted
English (Dolby Digital Plus 5.1)
.
.
.

What a weird category to put this setting. Why would anyone think to look in "Languages" to change a setting like this?