I am using amazon cognito for my web application. If I already registered using my email address, After that when I trying sign up using my google account with same email. After that I can see duplicate records in my user pool with same email. How to avoid this problem. I already know that fix via pre signup lambda trigger. But unable fix this issue, because I could not find proper documentation(AWS documentation not enough for this). Please let me know any one can fix this.
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