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How do I troubleshoot Amazon Cognito user migration Lambda trigger errors?

Why is Amazon Cognito not sending the verification code email or SMS text message with the ForgotPassword API?

How do I pass ClientMetadata to Lambda triggers in Amazon Cognito?

How do I troubleshoot errors related to Lambda triggers in Amazon Cognito?

I described a work-around here: https://github.com/aws-amplify/amplify-js/issues/8376#issuecomment-1036896944

[The docs for the Cognito ForgotPassword API call](https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_ForgotPassword.html#CognitoUserPools-ForgotPassword-request-ClientMetadata) say that Lambda triggers for `pre-signup, custom message, and user migration` will be invoked. I have a `pre-signup` trigger that works as expected on the `SignUp` action, but it is not being called when I submit a `ForgotPassword` action. [These docs] show trigger source values for `CustomMessage_ForgotPassword` and `UserMigration_ForgotPassword`, but there is no `PreSignUp_ForgotPassword` or similar. Is this a bug? Thank you!

Cognito Pre-Signup Lambda trigger not being called on ForgotPassword

Serverless

Compute

Security, Identity, & Compliance

Cognito presignup trigger fires twice or multiple time.

AppSync Unauthorized Error When Called From PreSignUp Lambda Trigger

Cognito PreSignup lambda is triggered multiple times at once

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Cognito Pre-Signup Lambda trigger not being called on ForgotPassword

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