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Amazon Cognito is a robust authentication provider that allows developers to add user sign-up, sign-in, and access control to their web and mobile applications. It supports authentication through social identity providers such as Facebook, Google, and Amazon, as well as enterprise identity providers via SAML 2.0 and OpenID Connect.
While using Amazon Cognito, you might encounter an error message labeled as UnexpectedLambdaException. This error typically manifests when there is an unexpected issue within a triggered AWS Lambda function associated with your Cognito user pool.
The UnexpectedLambdaException is an error code that indicates something went wrong unexpectedly in the Lambda function that was triggered by an event in your Cognito user pool. This could be due to a variety of reasons, such as incorrect logic in the function, missing permissions, or runtime errors.
To resolve the UnexpectedLambdaException, follow these steps:
Navigate to the AWS Lambda Console and select the function associated with your Cognito user pool. Check the logs in Amazon CloudWatch to identify any errors or exceptions that occurred during execution.
Once you have identified the error from the logs, review the Lambda function code to fix any logical errors. Ensure that all necessary permissions are granted to the Lambda execution role. You can refer to the AWS IAM Documentation for more information on setting permissions.
After making changes, test the Lambda function independently to ensure it executes correctly. Use the test feature in the Lambda console to simulate the event that triggers the function.
Once the function is working as expected, update the function code and deploy it. Ensure that the function is correctly linked to your Cognito user pool triggers.
By following these steps, you should be able to resolve the UnexpectedLambdaException in your Amazon Cognito setup. For further assistance, consider visiting the AWS Forums or consulting the AWS Support.
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