Yep! Two years ago this month!!
Another “fornever” bug.
Happy 2nd Year Anniversary!
Do you have the same issue if you follow the OP’s steps to reproduce it?
Provide extra information to complete the original description of the issue:
If relevant, provide additional screenshots/video:
the Big problem FS never fixed
Apparently this is a tough nut to crack. It seems very simple to me, if you can toggle it via the settings you should also be able to toggle it with a keybind, just like nameplates or any other thing. It just turns down the environment/engine sounds.
Please Asobo fix this small but helpful feature.
Imo this a the perfect example for the lack of polish in Msfs. They try to do the right thing but just end up breaking things or doing them half hearted and then never circle back for years and years all the while they half heartadly implement the next shiny thing.
There was a thread years ago asking them to just please slow down and do nothing but polish for a year or so. I wonder if it’s still lingering somewhere.
Asobo’s contract with Microsoft probably prevents them from doing that. “we spent the last 12 months polishing” doesn’t sound good in quarterly earnings reports for the shareholders.
The real hilarity is that this has been carried over from 2020.
“We built a brand new sim and brought bugs from 2020 to make you feel at home!”
Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes
Provide extra information to complete the original description of the issue:
no effect when assigning a value (keyboard key for example) to the 3 functions concerning headphone simulation
Are you using DX11 or DX12?
DX12
Are you using DLSS?
Yes
If relevant, provide additional screenshots/video:
Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes, never worked
Provide extra information to complete the original description of the issue:
The interactive notepad of the Zlin Aviation Norden does it seamlessly, the official keybind is dead, does not toggle the headphone simulation on or off. Please don’t prolong this bug even further, even if its a quality of life feature
Are you using DX11 or DX12?
still Yamaha DX7 (sry, its DX12)
Are you using DLSS?
No
SU2 fixed a lot of bugs, which is impressive and welcomed, but this one still remains. 
Asobo, please address this in SU3??
Still not fixed… 2020 and 2024
I’m getting the sense it will never get fixed.
it should be a 5 minute fix for them
#1 overlooked bug.
you have my vote!
I don’t really even understand that status.
instead of a triage system, where the complicated, urgent bugs get fixed with priority (i know they actually don’t, but bear with me…) could they not have a secondary “on every first tuesday of the month fix the really easy bugs that take 5 minutes and have been outstanding for 10 years” system?
Saw there was a keybind for this, got excited, then found this page lol. Glad its being looked at. Do hope it gets fixed soon, this is something I’d use a lot.