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Event ID: 100 Source: Microsoft-Windows-CertificationAuthority

Active Directory Certificate Services did not start: Could not load or verify the current CA certificate. Object was not found. 0x80090011 (-2146893807).
T774550 advises the following troubleshooting steps:
1. Load and confirm a valid CA certificate and chain
2. Confirm that a valid CA certificate exists on the computer hosting the CA
3. Confirm that a valid CA certificate exists in the AIA container
4. Validate the CA certificate chain
5. Check and publish CRLs
See the article for full details.
See the comments for Event id 100 from source CertSvc. The event is similar.

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