Mute Function not working in Latitude E7470 while using Windows 10, but on Linux (tried on Ubuntu Live)

Hi Team,

Let me explain the issue in detail.

The SSD of My Laptop (Latitude E7470) wasn't working, so I changed that and installed a new Copy of Windows 10 Pro. I created the Windows 10 Pro via USB Media Creation Tool from Microsoft Official Website. After installing the Windows 10 Pro I observed everything is working fine except 1 Mute button (which was wroking fine earlier by hitting either the combination of "Fn+F4" on Latitude E7470, or if "Fn+ESC" was pressed once, then only hitting "F4" would do that). Every single button in the Keyboard is working fine with the Fn combination, but not only the Mute function.

Keyboard Photo:

But, when I tried booting using a Live Ubuntu USB disk, this Mute functionality and every other button worked fine.

I wasted over 1 week time in figuring out that mute button issue - "it is not a Hardware issue, but a Driver/Software issue" which is not sending the appropriate command to the OS (Windows 10 Pro 21H2).

I have already updated Windows 10 pro latest versions and all drivers from Dell SupportAssist, and tried all possible steps from the internet till now for fixing this issue, but nothing worked.

Your help is highly required.

System About Information: