If your computer doesn't have the new Realtek DCH drivers (i.e. the configuration app is Realtek Audio Console), then find a slightly newer acer computer from the same laptop/desktop model range.

Then update following this method.

https://community.acer.com/en/discussion/588107/realtek-audio-problems-or-want-new-realtek-audio-drivers-follow-this-predator-pt917-71

Realtek 9200 and newer are Windows 11 certified.

I had the similiar problem... very annoying where my main speakers realtek had no sound output. I have predator helios 300 ph315-53 with os windows 11.

I thought for so long it was a hardware problem... but recently when I started my computer I heard the sound you get, when u start up your computer that sounds like a "rocket ship launch". By that, I knew that the sound works, so it had to be a software problem.

First time i unsinstalled only realtek sound drivers (in drivers manager), but this time I also I uninstalled all of my sound drivers including the ones on the software component that was audio related. I had my computer on around 5 minutues suddenly, i had my sound back... (think windows 11 updated the drivers on its on). IF it doesn't, just search for updates through  through your windows update in settings.

Hope this will help.

Note: Before this I also restarted all of my services related to sound functions. usually something with Audio. That didn't work for me but it can help sometimes