Hello,
Thank yo so much for posting here.
Here are some documents talking about AD CS migration. Hope they could be helpful to you.
Performing the Upgrade or Migration
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc742388(v=ws.10)?redirectedfrom=MSDN
AD CS Migration: Migrating the Certification Authority
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/ee126140(v=ws.10)#BKMK_GrantPermsAIA
Step-By-Step: Migrating The Active Directory Certificate Service From Windows Server 2008 R2 to 2019
https://techcommunity.microsoft.com/t5/itops-talk-blog/step-by-step-migrating-the-active-directory-certificate-service/ba-p/697674
For any question, please feel free to contact us.
Best regards,
Hannah Xiong
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