Hi,
Thank you for posting in Microsoft Q&A forum.
Per my understanding, you would like to set the MDM authority to Intune for these co-managed devices, not to transition from Configuration Manager co-management to Intune-only management. If I have misunderstood anything, please feel free to let me know.
Could you please share the screenshot of the device under Devices | Windows and double check the Intune managed workloads.
Thanks for your time. Have a nice day!
Best regards,
Simon
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