I have a requirement where I want to get the email address of person during filling the form. Once he enters the first and last name automatically his email address should popup .For eg: first name is Raj and last name is Sharma, so email address should display raj.sharma @gmail.com
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There is a function usersearch available under the Personalization Utilities plugin.
you can try
user(touniformstring(index(usersearch({"firstName","lastName"},{1,1},{"firstNamevalue","lastNamevalue"}),1,1)),"email")