This error typically indicates a configuration mismatch or a fallback failure.
Check the following:
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Domain Verification: Ensure your email or UPN domain is verified in Administration > Domain Verification.
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IdP Configuration: If the Secure Access Module falls back from NTLM/Kerberos to SAML, ensure that a valid Identity Provider (IdP) is configured in the Administration Console. Alternatively, if you prefer to use NTLM/Kerberos exclusively and do not wish to configure additional Identity Providers, see NTLM/Kerberos FAQ for further assistance.
