Question Can't get 5.1 to work with optical on Windows 10

[Djjilis]

Hi all,

I've been Googling and fidgeting around and just can't get it to work.
Output:
ASUS B550-Pro motherboard Optical out

Input:
Optical-in Logitech Z275

The speakers are set up correctly around the Livingroom.

Sound from games, movies, YouTube etc. plays Stereo right now but not 5.1.

I used this video to test whether it worked automatically or not but when the left speaker plays sound the back left speaker also plays sound, same goes for right.

View: https/www.youtube.com/watch?v=PqVCPE8_ntE


When I choose to connect sound with HDMI the 5.1 is greyed out:

When I choose optical nothing shows:

I tried the Realtek Audio Console but there is no mention of 5.1 in the main menu or advanced.

However, and this spins me off, when I go into Sound Settings -> right click Realtek Digital Output -> Properties -> Supported Formats, I see under "Encoded Formats": "DTS Audio" and "Dolby Digital". With next to it a Test button:

And when I test either function it WORKS!!!

So how and where do I enable this sound setting that by testing obviously works?!

I'll stop driving myself crazy and await some tech-god to alleviate me from this insanity.

Kind regards and thanks in advance.