Register a user with name, email and cell phone. After that, log in with Facebook. And I register another user with the same email.

I have two users with the same email.

How do I solve that problem?
AWS AMPLIFY AND COGNITO

Image:
https://dev-to-uploads.s3.amazonaws.com/i/r7u3pmm5ztjn9z66g7mm.jpg

aws #amplify #cognito