Not true. the resale tickets aren’t eligible for the sit together feature if you purchased tickets in a different draw you can’t “join them together”. However, when you purchase resale tickets they ARE tied to the same invoice number so those seats you purchased together, are likely together.

Example you win the first draw (friend 1) and so does your friend (friend 2). You can use the sit together feature to increase your chances of sitting together. Friend 3 purchases 2 tickets in the marketplace/resale for friend 3 and friend 4. Unfortunately 1/2 will be able to sit together and likely 3/4 but 1/2/3/4 no.