user pool - link style email verification fails to deploy

Reported by @0xdevalias -

const userPool = new cognito.UserPool(this, 'UserPool', {
  // ..snip..

  userVerification: {
    emailSubject: 'Confirm your account on REDACTED',
    emailBody:
      'Hello {username}, welcome to REDACTED! Use the following link to verify your account: {####}',
    emailStyle: cognito.VerificationEmailStyle.LINK,
    smsMessage:
      'Hello {username}, welcome to REDACTED! Use the following code to verify your account: {####}',
  },

  // ..snip..
})

generates the following error -

1/3 | 8:50:23 PM | UPDATE_FAILED        | AWS::Cognito::UserPool                | UserPool (UserPool6BA7E5F2) The message is invalid. (Service: AWSCognitoIdentityProviderService; Status Code: 400; Error Code: InvalidParameterException; Request ID: c3ce01b4-a431-4475-82fd-fdc30fec3660)
	new UserPool (/Users/devalias/dev/REDACTED/packages/REDACTED-infrastructure/node_modules/@aws-cdk/aws-cognito/lib/user-pool.js:73:26)

[nija-at]

@0xdevalias - Try putting {##Verify Email##} instead of {####}. This might work.

[nija-at]

@0xdevalias - it seems to me that the correct thing to do here is to not set the EmailVerificationMessage and EmailVerificationSubject properties when the ‘CONFIRM_WITH_LINK’ option is used.

This would look like -

const cfnuserpool = userpool.node.defaultChild as CfnUserPool;
cfnuserpool.emailVerificationMessage = undefined;
cfnuserpool.emailVerificationSubject = undefined;

Can you check if this works for you, and sets up the user pool as you would expect?