This post only explain to you and myself that the warning appears on the Event Viewer, every time you install an ADCS (Active Directory Certificate Services), is not a problem. Sometimes we assume that a warning event log may indicate a problem. This warning also remind us to verify whether the CA Certificate has been published correctly in the Active Directory or not.
The warning event log:

The verification step was explained on the detail information of the log:

It’s not a problem. The verification of the CA Certificate completed successfully.

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