Forum Discussion
Sensitivity label "Certificate Error"
When applying Sensitivity Labels in Microsoft Office applications, we receive the following certificate warning: "The certificate issuer for this site is untrusted or unknown. Do you wish to proceed...
Since the issue occurs only for domain users on the same machine, the problem is likely within the user context (Current User certificate store, GPO-applied certificates, cached RMS/MSIP credentials, or proxy settings) rather than network connectivity.
Before making changes, please click View Certificate on the warning dialog and provide:
- Certificate Subject
- Certificate Issuer
- Certification Path
- Thumbprint
Also compare the Current User certificate stores between:
- Working local account
- Affected domain account
Particular attention should be given to:
- Trusted Root Certification Authorities
- Intermediate Certification Authorities
- Personal Certificates
If the issuer differs between the working and failing account, that will usually identify whether the certificate is being injected by a GPO, security product, proxy, or whether there is a trust-chain issue in the user's profile.
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Hope this will help you.