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Vanguard attestation failure
2026-02-25
valorant, vanguard, attestation
The following explains how to resolve the Vanguard error in Valorant when the message VAN 9101: Attestation Failure – Security Violation (#0000002) appears.
- If the following error appears:
“This build of Vanguard cannot run on untrusted machines. Please restart your computer and try again.” (Figure 1)
Figure 1
- The error is related to compatibility issues in Windows 11 26H1.
- Recommended solutions:
Update to the latest 26H1 build (2800.1575), or
Use Windows 11 25H2, which has verified compatibility.