I'm trying to blocked duplication by elements.xml I read that an element must be indexed and i have to use the EnforceUniqueValues

So i added on my elements.xml


But when i create a customer by way of that element i can still get a duplicate. I would like to not do that on a Event Receiver.

Required="TRUE" EnforceUniqueValues="TRUE" Indexed="TRUE" Sealed="TRUE"

I added that on the Elements.xml but also on the schema.xml

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