Hi @ErasSeller
Ticketmaster and Stubhub are separate companies and have separate systems. To let Stubhub know that the transfer has gone thru you have to go to your open sales and confirm that you have transferred the tickets
@Melpik is correct. You also need to make sure that you log into the primary's app and transfer them to your buyer if you haven't already. The only case where this wouldn't apply is if you uploaded PDF tickets when you created the listing.
If neither of these apply to you or if you have any further questions, you can send a private message to @TeamStubHub1 and they can help you out.