I'm unable to map 5.1 audio on audio channel mapping settings

I have a 5.1 surround system that works perfectly. I currently use a third party audio console to manage my audio troughout my computer. I have tried using adobe audition without that application and it works in the exact same way that it is working right now. I can't map the rest of the channels to work with 5.1 audio because there is no more options as shown in the picture. I can work normally with Audition but I just can't map the rest of the channels. I can listen to music and movies with the setup I have right now and I have no problems with getting 5.1 surround, it is just Audition that doesn't let me use the rest of the channels. I have the lastest Realtek audio drivers and I have my setup configured in the Realtek Audio Console. Is there any other thing I'm not looking at? How can I make it work?

Specs: Ryzen 5 3600, Radeon RX 570, 16GB RAM, Windows 10, Adobe Audition Pro 2020 Lastest Version