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How to Create a New Entra ID Enterprise Application and Configure Custom Attributes for SAML Login for AWS Cognito

  • EntraID users’ user.objectid attribute is unique compared to other attributes, so it is recommended to use it as an identifier
  • Unique User Identifier attr. value under Entra ID > User Attributes & Claims should be set to user.objectid in AWS Cognito
  • In Entra ID's single sign-on section, Token endpoint value should be set to: https://cognito_domain_url/oauth2/token
  • Federation metadata URL must be retrieved from Entra ID, copied, and added in AWS Cognito
  • Identity Provider (Entra ID) should be added under Federated identity providers to configure the AWS user pool
  • Attributes to be mapped via SAML schema in AWS Cognito must be defined
  • After successful authentication via the external IdP, users will be created in Cognito user pool and their user attribute identities will store metadata
  • Users’ fields will be updated upon validation, so the attributes passed via JWT will be up-to-date
  • By following these steps, you get a fully functioning solution for federated authentication with an external Entra ID and can ensure identity data stays consistent

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