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The SP did not receive one or more attributes or values it requires for basic identification and/or personalization purposes. This typically applies to unique identifiers, name, and email address attributes that are common to federated interactions.
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The user is not authorized to access the SP. This may be caused by an inadequate assurance level (when expressed independently of authentication), entitlements, affiliation, or missing attribute or value. An SP may deny user access due to local authorization control measures.
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The SP received an invalid/inappropriate authentication context, for example, an SP requires MFA, but the assertion sent by the IdP does not contain the appropriate MFA authentication context.
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Other errors - an SP has encountered an error and has evidence that the condition could be remedied by the end-user or IdP organization with relatively minimal further involvement by the SP.
(May 15)