SAML:aud context key
SAML:aud https://signin.aws.amazon.com/saml
AudienceRestriction and Audience https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_providers_create_saml_assertions.html#saml-attribute-mapping
aws sts assume-role-with-saml
sts:AssumeRoleWithSAML
SAML:EduPersonOrgDN
SAML:EduPersonOrgDN, SAML Role Attribute, assume-role-with-saml
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