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Amazon Cognito
Developer Guide

Customizing User Invitation Messages

You can customize the user invitation message that Amazon Cognito sends to new users via SMS or email by editing the templates under the Do you want to customize your user invitation messages? heading.

Important

Your custom message must contain the {username} and {####} placeholders, which are replaced with the user's username and password before the message is sent.

For SMS, the maximum length is 140 UTF-8 characters, including the verification code. For email, the maximum length for the message is 20,000 UTF-8 characters, including the verification code. HTML tags can be used in these emails.