Yes, you will need a separate email address for every applicant that you plan to order a TransUnion Full Credit report for.
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Many landlords choose to run a background report on each tenant applicant that is 18 years or older.

If you have an applicant that is married and also has a 24-year-old child living with them you'd want to get the email address of the applicant, spouse, and adult child.
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This way you can be assured that each adult living in the home has a clean background and is not a risk for your rental property.