OptiPlex SFF Plus 7020 microphone input cannot be found on Windows 11 (3 ring jack)

Hello all,

we have multiple OptiPlex SFF Plus 7020 computers running Windows 11. We also have multiple headsets with in-ear and microphone(3 ring jack) on front area (desktop computer has only one input in front, it has little headset sign near it so in should be possible to work concerning hardware). Unfortunately whatever we do, we cannot get the mic working. Every driver we install, headset sound always works, but mic is unavailable. Does Dell even has support for Windows 11 for headsets (microphone part)? In all our computers on Windows 10 everything works "out-of-the box" in every case. Tried with multiple drivers, Realtek, OS is up to date. 

We are getting desperate, lost a lot of time because we have a lot of same computers and headsets with integrated microphone. On windows 10, when we plug in headset, we get popup "Which device did you plug in?" and we choose (in-ear), and mic and sound always works, but on windows 11 nothing happens (sound always works, but mic never). Is this popup mandatory for expected outcome on windows 11? Can you help us step by step which drivers or utilities to install to make microphone work?

Sending you computer details, thanks in advance: 

OS Name    Microsoft Windows 11 Pro
Version    10.0.22631 Build 22631
Other OS Description     Not Available
OS Manufacturer    Microsoft Corporation 

System Manufacturer    Dell Inc.
System Model    OptiPlex SFF Plus 7020
System Type    x64-based PC
System SKU    0C6F
Processor    Intel(R) Core(TM) i7-14700, 2100 Mhz, 20 Core(s), 28 Logical Processor(s)
BIOS Version/Date    Dell Inc. 1.3.1, 19.3.2024.
SMBIOS Version    3.6
Embedded Controller Version    1.02
BIOS Mode    UEFI
BaseBoard Manufacturer    Dell Inc.
BaseBoard Product    0P6Y94
BaseBoard Version    A00
Platform Role    Desktop
Secure Boot State    Off
PCR7 Configuration    Elevation Required to View
Windows Directory    C:\Windows
System Directory    C:\Windows\system32
Boot Device    \Device\HarddiskVolume1
Hardware Abstraction Layer    Version = "10.0.22621.2506"
Installed Physical Memory (RAM)    16,0 GB
Total Physical Memory    15,7 GB
Available Physical Memory    10,5 GB
Total Virtual Memory    16,7 GB
Available Virtual Memory    11,5 GB
Page File Space    1,00 GB
Page File    C:\pagefile.sys
Kernel DMA Protection    On