Hi,
Thanks for your reply.
As you have installed KB 4578605 and clients have upgraded to version 5.00.9012.1052 before completing the co-management onboarding process. It looks like the scenario described in KB4575787:
Co-management enrollment takes longer than expected for Configuration Manager clients
If clients have not yet upgraded to version 5.00.9012.1052 from KB 4578605, it is recommended first to disable automatic client upgrade on the Client Upgrade tab of Hierarchy Settings. This removes the need to upgrade clients twice in a row: once from the update rollup and once from this standalone update. The client.msp file shipping in this update contains all of the prior changes that shipped with update rollup KB 4578605.
Best regards,
Simon
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