The first name and the last name have to be entered exactly as they appear in the email with the order number and serial/license number.  I found out the hard way with the name info (took 2 or 3 tries before I thought to double check to see what name I had used). Also, if your doing a copy/paste make sure you have no leading or trailing spaces in any of the info.

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My Rendo Gallery ........ My DAZ3D Gallery ........... My DA Gallery ......