Hi tommy soo,
Thank you for reaching out and providing detailed context. Enrolling existing devices into Windows Autopilot in a hybrid environment is possible, but it does require specific configuration steps. Since your devices are re-imaged via MDT and already hybrid Azure AD joined with Intune enrollment, you're on the right track.
To enable Autopilot for existing devices, ensure you're using the Windows Autopilot for Existing Devices scenario, which involves applying a deployment profile via a JSON file during the MDT task sequence. You can find guidance and templates for this setup on Deployment Research. Also, confirm that your Intune Connector for Active Directory is properly installed and configured, and that your domain join profile is mapped to the correct OU2.
Regarding the reset issue, you're correct that Autopilot Reset is not supported in hybrid environments. Instead, consider using a re-deployment strategy with Autopilot profiles and MDT task sequences tailored for re-issuance. The “Fresh Start” and “Wipe” options may fail if system components or policies block reset operations, especially in hybrid domain-joined scenarios.
Let us know if you'd like help reviewing your deployment profile or MDT integration steps.
Best regards,
Quinnie Quoc.