Steam might be having an inventory problem, and it is not loading. That is the reason why our bots cannot send an item to your account.
But do not worry; this problem is manageable, and you will get your skin. Usually, Steam starts working in a couple of hours. Try withdrawing your skin again after a while. Everything should work.
You can check the status of your inventories at https://steamstat.us/.
If the status is like one in the photo, then the bots cannot send the item; their inventory is not loaded.
The only solution is to wait for Steam to reload.