SF Express signed for it, but it didn't claim the code.

Does the subject want to ask, "Why did SF sign for it but didn't pick up the code?" ? The delivery staff missed, and the delivery of the pick-up code was delayed.

1. Omission of the delivery staff: the delivery staff forgot to provide the pick-up code and put the package at the designated location for others to sign for. Contact the delivery personnel and courier company to explain that they have not received the pick-up code and ask if they can provide other ways to confirm their identity.

2. Delay in sending the pick-up code: Sometimes, it takes a while to send the pick-up code by SMS or other means. Wait patiently for a few hours to confirm whether you will receive a code pick-up notice.