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My Store > Store setup > General settings > Customers
for duplicates regardless of whether this field is used.
If you also wish to check duplicate emails for social logins, go to [Customers>Customer... accounts>Account signup fields] and check the box in the [Social media signup] column for the [Email] field.
Find password
Send a temporary password
A... will display customer levels.
[Pages: Cart, Checkout, Order Completed, My shopping, Edit customer information, Product details]
Link social media