If none of the above works, VSS system files may be corrupted.
: The security certificate between the Backup Exec server and the remote computer is missing or invalid. 0xe00086cc backup exec
The Backup Exec Service Account (BESA) or the System Logon Account has an outdated, expired, or modified password in Active Directory that has not synced with the local console. If none of the above works, VSS system
What (e.g., 21.x, 22.x) are you currently running? If none of the above works
Troubleshooting Backup Exec Error 0xe00086cc: Ultimate Resolution Guide
Backup Exec uses trust relationships to authenticate between the media server and remote agents. When error 0xe00086cc occurs due to authentication failures, re‑establishing the trust can resolve the issue: