<p>Creates a new user in the specified user pool.</p> <p>If <code>MessageAction</code> isn't set, the default is to send a welcome message via email or phone (SMS).</p> <note> <p>This action might generate an SMS text message. Starting June 1, 2021, US telecom carriers require you to register an origination phone number before you can send SMS messages to US phone numbers. If you use SMS text messages in Amazon Cognito, you must register a phone number with <a href="https://console.aws.amazon.com/pinpoint/home/">Amazon Pinpoint</a>. Amazon Cognito uses the registered number automatically. Otherwise, Amazon Cognito users who must receive SMS messages might not be able to sign up, activate their accounts, or sign in.</p> <p>If you have never used SMS text messages with Amazon Cognito or any other Amazon Web Service, Amazon Simple Notification Service might place your account in the SMS sandbox. In <i> <a href="https://docs.aws.amazon.com/sns/latest/dg/sns-sms-sandbox.html">sandbox mode</a> </i>, you can send messages only to verified phone numbers. After you test your app while in the sandbox environment, you can move out of the sandbox and into production. For more information, see <a href="https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-identity-pools-sms-userpool-settings.html"> SMS message settings for Amazon Cognito user pools</a> in the <i>Amazon Cognito Developer Guide</i>.</p> </note> <p>This message is based on a template that you configured in your call to create or update a user pool. This template includes your custom sign-up instructions and placeholders for user name and temporary password.</p> <p>Alternatively, you can call <code>AdminCreateUser</code> with <code>SUPPRESS</code> for the <code>MessageAction</code> parameter, and Amazon Cognito won't send any email. </p> <p>In either case, the user will be in the <code>FORCE_CHANGE_PASSWORD</code> state until they sign in and change their password.</p> <p> <code>AdminCreateUser</code> requires developer credentials.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}