Amazon Cognito UserPoolTaggingException

An error occurred while tagging the user pool.

Understanding Amazon Cognito

Amazon Cognito is a powerful authentication service provided by AWS, designed to manage user sign-up, sign-in, and access control to web and mobile applications. It offers secure user directory management and supports social identity providers like Facebook, Google, and Amazon, as well as enterprise identity providers via SAML 2.0 and OpenID Connect.

Recognizing the Symptom

When working with Amazon Cognito, you might encounter the UserPoolTaggingException. This error typically arises when there is an issue with tagging a user pool. The error message might look something like this:

UserPoolTaggingException: An error occurred while tagging the user pool.

Exploring the Issue

The UserPoolTaggingException is triggered when there is a problem with the tagging request for a user pool. Tags in AWS are key-value pairs that help organize and manage resources. This exception indicates that the tagging operation did not meet the required format or constraints.

Common Causes

  • Invalid tag key or value format.
  • Exceeding the maximum number of tags allowed.
  • Using reserved prefixes in tag keys.

Steps to Resolve the Issue

To resolve the UserPoolTaggingException, follow these steps:

Step 1: Verify Tag Format

Ensure that your tags adhere to the AWS tagging format. Tag keys and values should be strings with a maximum length of 128 and 256 characters, respectively. Avoid using special characters.

Step 2: Check Tag Limits

Amazon Cognito allows a maximum of 50 tags per user pool. If you exceed this limit, remove unnecessary tags or consolidate them.

Step 3: Avoid Reserved Prefixes

Do not use the aws: prefix in your tag keys, as it is reserved for AWS use. Ensure your custom tags do not start with this prefix.

Step 4: Update Tags via AWS CLI

If you need to update tags, you can use the AWS CLI. Here is a sample command to update tags:

aws cognito-idp tag-resource --resource-arn --tags Key=Environment,Value=Production

Replace <your-user-pool-arn> with your actual user pool ARN.

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