TD will occasionally require a one-and-the-same letter for accounts that one person holds but have different versions of their name on. Examples would be maiden name versus married names or initials in different spots (A John Smith vs Alfred J Smith).
When they ask for a one-and-the-same letter, the inserted (and attached) example is what they're looking for. It's simply a piece of paper that has both names written out and signatures by the client in both formats their name appears in.
As always, email firstname.lastname@example.org or call 360-301-7579 if you have any questions!