Do search for a Users email who submitted a form within a repeating group

Hello can someone help me with the best way to do this

I have a data type where users submit a form uploading an image the user already exist in my app, I want to click a button that says your upload as has been approved in a email sent to the user, I have tried everything with the do search but can not get the email of the particular user

can some guide me how how to searc?

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