what to do when AWS Cognito's SMS Multi Factor Authentication returns invalid code or auth state

What steps should I take when AWS Cognito's SMS Multi-Factor Authentication returns an invalid code or authentication state, and how can I troubleshoot this issue effectively?

When AWS Cognito's SMS Multi-Factor Authentication (MFA) returns an invalid code or authentication state, you can follow these steps to troubleshoot and resolve the issue:

Check Phone Number Verification: Ensure that the phone number is verified in the user pool. Unverified phone numbers can cause issues with MFA.

Review IAM Role Permissions: Verify that the IAM role used for SMS configuration has the necessary permissions, including sns:Publish.

Validate Configuration: Double-check the configuration settings in your user pool to ensure that everything is set up correctly.

Check Message Delivery: Make sure that SMS messages are being delivered correctly and that there are no issues with the carrier.

Inspect Error Messages: Look at the specific error messages returned by AWS Cognito to identify the root cause.

By following these steps, you can effectively troubleshoot and resolve issues with AWS Cognito's SMS Multi-Factor Authentication.