Its solved.  Don't use the headphone jack the hardware is incompatible with the software.  Use a USB headset instead 
  I was first under the impression this could be related to a virus or malware, but even after refreshing with a clean Windows 10 installation, when I plug in my headset into the jack, the message comes to to choose what was plugged in (So the drivers are installed) And then I choose Headset (Over-ears)  The line input is just one stereo jack, and it used to have worked. My mic picked up and the audio picked up on the mic. [IMAGE] But still the only mic active is the built-in mic on the laptop.   [IMAGE] I have seen posts online that people say you go to: C:\Program Files\Realtek\Audio\HDA\RtkNGUI64.exe and under advanced you change settings there.But the closest I have got is: C:\Program Files (x86)\Realtek\AudioAnd in that folder I have Drivers & InstallShield Nothing of use is located in InstallShield, and the one .exe in Drivers is: RtlUpd64.exe that does nothing when I run it.I have also went to the support page on the DELL Support entered the service tag and downloaded the 1.05GBThat's this file: Realtek-High-Definition-Audio-Driver_TXHH9_WIN_6.0.9268.1_A05.EXEWhen I run that setup it uninstalls all the Audio Driver and then wants to reboot.After the reboot I have no drivers installed.Then I run that file again, and nothing happens.The box doesn't auto open when you plug in your headset eithers.So now I have upgraded to Windows 11, and still is does the EXACT same thing.It used to work fine, and now it doesn't anymore - even after a clean install. And all the Windows Updates have completed.Under device Manager, if I update driver, there are no new updates found.
Microphone not plugged in