Hi,
Thank you for posting in Microsoft Q&A forum.
==>What would happen if I applied co-management to all devices (SCCM-Intune) and at the same time an MDM enrollment GPO per active directory?
Per my experience, you can use either of them for your scenario. However, it's not recommended to do both of them at the same time because this may lead to potential issues.
Thanks for your time. Have a nice day!
Best regards,
Simon
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