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I'm using a lambda function to customize confirmation emails with AWS Cognito. My lambda function seems to work fine and looks like this:
exports.handler = async (event, context, callback) => {
const sampleTemplate = `<html>
<body>
<div>${event.request.codeParameter}</div>
<div>${event.userName}</div>
</body>
</html>`
if (event.triggerSource === "CustomMessage_AdminCreateUser") {
event.response.emailSubject = 'Lets hope this works'
event.response.emailMessage = sampleTemplate
console.log(event.response) // Logs look as expected
}
callback(null, event);
};
The problem is that when the emails arrive the message body is being overwritten by the content in the User Pools > Message Customizations tab. The subject line is working fine, but the email body is being overwritten. For example, the cognito settings look like this:
And the emails look like this:
As you can see, the lambda function worked for setting the email's subject line, but not the actual content. I can't find any setting to turn off that content and it can't be left blank... Any help is much appreciated.
780
For anyone finding this, I was able to find the answer. When using the CustomMessage_AdminCreateUser event, cognito will silently throw an error if you use event.userName in the template. Instead use event.request.usernameParameter and it will work
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