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Amazon Cognito AliasConflictException

An alias conflict occurred during user registration or update.

Understanding Amazon Cognito

Amazon Cognito is a robust authentication service provided by AWS that enables developers to add user sign-up, sign-in, and access control to their web and mobile applications. It supports social identity providers like Facebook, Google, and Amazon, as well as enterprise identity providers via SAML 2.0 and OpenID Connect.

Identifying the Symptom: AliasConflictException

When working with Amazon Cognito, you might encounter an error known as AliasConflictException. This error typically arises during user registration or when updating user attributes.

What You Observe

When this exception occurs, you will see an error message indicating that an alias conflict has been detected. This prevents the user from being registered or updated successfully.

Details About the AliasConflictException

The AliasConflictException is thrown when a user attempts to register or update their account with an alias (such as an email or phone number) that is already associated with another user in the user pool. Amazon Cognito requires that aliases be unique across all users in a user pool.

Why This Happens

This issue occurs because Amazon Cognito uses aliases as unique identifiers. If an alias is already in use, it cannot be assigned to another user.

Steps to Resolve AliasConflictException

To resolve this issue, follow these steps:

Step 1: Identify the Conflicting Alias

First, determine which alias is causing the conflict. This can be done by checking the error message details or reviewing the user pool settings.

Step 2: Ensure Unique Aliases

Ensure that the alias you are trying to use is unique. You can do this by querying the user pool to check if the alias is already in use. Use the AWS CLI or SDK to list users:

aws cognito-idp list-users --user-pool-id --filter "email = \"[email protected]\""

Replace [email protected] with the alias you are checking.

Step 3: Update or Register with a Unique Alias

If the alias is in use, choose a different alias or update the existing user's alias to free up the desired alias. Then, proceed with the registration or update process.

Additional Resources

For more information on handling alias conflicts, refer to the Amazon Cognito User Pool Settings documentation. You can also explore the Amazon Cognito FAQs for common questions and solutions.

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