Why can't I send a verification Email Link in AWS Cognito?

Hi Gio

You've successfully implemented user creation with email verification code in your Ionic app using AWS Cognito. However, upon changing the verification method to a link in the Cognito console, you encounter a 400 error and the user isn't created. This indicates a potential misconfiguration or unexpected behavior within Cognito.

Hope checks these steps to help resolve issue:

• Double-check Cognito console settings: verification method, email configuration, custom templates.

• Verify Ionic app code for correct link verification handling.

• Check IAM permissions, SES status, and Lambda functions if used.

• Create a new Cognito User Pool to isolate the issue.

• Enable Detailed Logging: Increase the logging level in your Cognito User Pool to capture more detailed information about the error.

• Test with Different Email Providers: Try sending verification emails to different email providers to isolate potential issues.

• Check for Throttling: If you're creating users rapidly, you might be hitting Cognito's throttling limits. Implement retry logic or exponential backoff.

• Verify Email : Ensure that your email provider or domain is not blocking emails from AWS.

https://medium.com/aws-lambda-serverless-developer-guide-with-hands/amazon-cognito-main-features-user-pools-and-identity-pools-uses-cases-and-how-it-works-20fbe94b1905