I see this item is held at library X, so why didn't my request build a rota?

There are several reasons this may happen. One reason is that the item may be owned but not available; VDX will not add a library to the rota if the item is checked out, being held or transferred. Another reason is that VDX could not tell that two records are for the same item. Usually this is caused by slight cataloguing differences in the title or if there isn’t an ISBN in the request.