@TechQ Thanks for posting in our Q&A.
For this issue, apps will not be synced from on-premises AD to intune.
If the device is Hybrid Azure AD joined device (both on-premises AD and Azure AD), it is suggested to use GPO or Autopilot Hybrid Azure AD join method to enroll the device to intune. Then deploy apps via intune.
GPO enrollment:
https://learn.microsoft.com/en-us/windows/client-management/enroll-a-windows-10-device-automatically-using-group-policy
Autopilot Hybrid Azure AD join:
https://learn.microsoft.com/en-us/mem/autopilot/windows-autopilot-hybrid
Please note only the apps deployed from intune can be removed from intune.
Hope it will clarify something.
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