If an email is already registered in the business as loyalty or eClub and if anyone tries to edit any other email address which already exists then it will display the error "the email has been taken".
For example, if the guest has already signed up using the email address "email@example.com" through which already a loyalty account is created. Now if the guest again tries to signup again to create an account using the same account using the same email address "firstname.lastname@example.org" then he will receive the error message which I have attached below to show as an example:
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