It is recommended that before you start with your dynamic content you should prepare a small list of contents with test addresses that include all possible combinations: gender, state, date of birth, etc. That is, of all the fields of your database including the custom ones that you will include in your creative
That way, when you do a preview of your campaign or do a test campaign you choose the users who have all the data completed and you will get a taste of how they view each of the combinations.
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