Adalo Signup Error Fix (Hindi)

I run a grocery-delivery startup built on Adalo and need a quick, screen-shared fix for the “User email already exists” problem that pops up whenever a new customer tries to sign up with an address already in the database... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, API Integration, Database Management, JavaScript, Mobile App Development, PHP, User Experience Research, User Interface / IA)