AWS Cognito now supports inbound federation Lambda triggers that let you transform and customize federated user attributes during authentication. This feature solves common problems like attribute size limits (2,048 characters) by allowing you to modify, add, override, or suppress attribute values from external SAML and OIDC providers before they're stored in your user pool. The triggers work with hosted UI and managed login, and can be configured through the AWS Console, CLI, SDKs, CDK, or CloudFormation.
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