Xbox one Audio issue - optical cable no longer playing 5.1 surround sound

I have the same issue with my Xbox. If it is connected via HDMI the 5.1 sound will rarely work going to my surround sound receiver regardless of what the settings are in the Xbox but if I connect it using an optical audio cable the 5.1 works without fail.

The Xbox is an Arcade edition.

First, try going to Settings > Display and Sound > In the middle, change the "HDMI Audio" setting to '5.1 uncompressed'.

If you still can't get 5.1 audio to your sound system, try buying an optical audio cable and plug that from the back of your xbox one into your sound system and change the settings on your sound system to use the 'Optical In' or a setting that chooses that
input. Don't forget to change the settings like the one above, but under "Optical Audio" choose "Bitstream Out" and change "Bitstream Format" to "DTS Digital Surround." The optical audio port is right between the HDMI in and out ports.

For more info see this page:
support.xbox.com/.../configure-audio-settings

After some heavy google research i think I've found a solution but would be interested on anyones thoughts.

So at the moment my audio setup is Xbox > TV > Surround Sound, but it appears this may cause the issue because most TV's dont output 5.1 surround sound so if I were to use optical audio to go xbox > surround sound, this may fix the issue...

So my optical from xbox to receiver and selecting DTS digital is going to give me 5.1 surround?

It def sounds really good when watching netflix.. but ive always thought uncompressed 5.1 under the hdmi audio setting on the xbox would give me better surround sound?

I have the same sound bar. If you hook the sound bar up straight to the xbox one with a digital optical audio cable and not your tv the DTS on the sound bar will work. Works with games, blu-rays and my comcast cable hd channels that support 5.1. The DTS
light on the vizio sound bar Wil light up when you turn on it on and when you change input on the sound bar and shortly turn off indicting it's working. These are my settings, HDMI audio off. Optical audio DTS Digital Surround. And under tv & one guide settings,
click troublshooting, I have surround sound (beta) checked. Only thing I don't know if DTS or Dolby digital is better. With the march update I will have the option to choose DTS or Dolby digital that the vizio 5.1 sound bar does support.