@Andreas, Thanks for posting in Q&A.
In General, Intune mainly focus on the app which are deployed via Intune. For the app which are not deployed via Intune, you can check to see if it can be removed via PowerShell script. Based as I know, some apps can also be uninstalled via Win32. You can check if the app has silently uninstalled command. If yes, then you can try to deploy the package via Intune win32 and assign the user or device group under uninstall assignment to see if the app can be uninstalled.
https://learn.microsoft.com/en-us/mem/intune/apps/apps-win32-add#step-7-assignments
Or you can create a PowerShell and upload it into Intune to uninstall apps.
Here are content of script to uninstall Sonicwall Netextender you can refer.
#Restart Process using PowerShell 64-bit
If ($ENV:PROCESSOR_ARCHITEW6432 -eq "AMD64") {
Try {
&"$ENV:WINDIR\SysNative\WindowsPowershell\v1.0\PowerShell.exe" -File $PSCOMMANDPATH
}
Catch {
Throw "Failed to start $PSCOMMANDPATH"
}
Exit
}
#Uninstall Sonicwall NetExtender
Start-Process -FilePath "C:\Program Files (x86)\SonicWall\SSL-VPN\NetExtender\uninst.exe" /S
Start-Process Msiexec.exe -wait -ArgumentList /'x {EF06A6A8-6B81-4A09-8223-789953972FFF} REBOOT=ReallySuppress /qn'
#Remove Sonicwall NetExtender Profiles
Remove-Item -Path "HKLM:\SOFTWARE\Sonicwall" /s
Non-official, just for reference.
Here is a link about how to deploy PowerShell script in Intune.
https://learn.microsoft.com/en-us/mem/intune/apps/intune-management-extension
Hope the above information can help.
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