Presignup invocation failed due to error accessdeniedexception.

Explanation for “presignup invocation failed due to error AccessDeniedException”:

When you receive the error message “presignup invocation failed due to error AccessDeniedException”, it means that the user attempting to perform the presignup action does not have the required permissions to do so.

This error is often encountered when working with AWS (Amazon Web Services) resources and services. AWS Identity and Access Management (IAM) is a key component in controlling access to these resources. It allows you to manage permissions and create policies to define who can access specific actions and resources within your AWS account.

To resolve the “AccessDeniedException” error, you need to review and modify the IAM policies associated with the user or role attempting to perform the presignup action.

Example:

Let’s say we have an AWS Cognito user pool with a Lambda trigger set up on the pre signup event. This trigger is responsible for executing some custom logic before allowing a user to sign up.

When a new user tries to sign up, Cognito invokes the Lambda function associated with the pre signup trigger. However, if the IAM role associated with the Lambda function does not have the necessary permissions, an AccessDeniedException error might occur.

To fix this issue, you can follow these steps:

1. Open the AWS Management Console and go to the IAM service.
2. Find the IAM role that is attached to the Lambda function.
3. Edit the role’s permissions by adding the necessary policies that grant access to the required resources and actions.
4. Save the changes and ensure the updated IAM role is associated with the Lambda function.

By granting the appropriate permissions to the IAM role, you should be able to resolve the AccessDeniedException error and allow the presignup action to execute successfully.