The W9s are handled directly by DocuSign. Unfortunately, because of this, they are not always propagated instantly. The developers do run the page imports as often as possible, though it can sometimes take a little while to be processed and synced.
Missing a W9 will not prevent from earning commissions, however you will not be able to receive instant commissions until the W9 is propagated.
If you do not see your W9 submitted after one week in your account please submit a support ticket.