Short version: in almost every case the item's trade lock has not ended yet. Nothing is wrong and nothing is lost, the item stays safely in your Tradeit Inventory until the timer reaches zero, then the Withdraw button works. If there is no timer left and it still will not withdraw, your Steam account is missing one of Steam's requirements for receiving items.
Is your item still trade locked?
Open My Tradeit Inventory and look at the item. If it shows a countdown, it is trade locked and cannot be withdrawn to Steam yet.
This lock is a Steam rule, not a Tradeit hold. It can last up to 7 days and there is no way for us or for you to shorten it. Your item is safe in your Tradeit Inventory the whole time.
Once the countdown reaches zero, select the item and click Withdraw to my Steam inventory, then accept the Steam trade offer sent by the Tradeit bot. More detail in Can I withdraw trade-locked items? and What is Steam Trade Protection?
What does my Steam account need to receive items?
If the lock has ended and the withdrawal still fails, Steam is refusing the trade offer. To receive items from Tradeit, your Steam account must have all of the following:
Steam Guard enabled for 15 consecutive days.
Steam Mobile Authenticator enabled for 7 consecutive days.
An account level higher than 0.
Your Steam inventory set to public.
The day counts must be unbroken. If you turned Steam Guard or the Mobile Authenticator off and on again, the count restarts from the day you switched it back on.
Fix anything on that list, then try the withdrawal again from My Tradeit Inventory.
The lock has ended and my account meets everything
Then something on our side needs a manual look. Contact our support team from the chat on the site and include your Steam profile link and the name of the item. Your item stays in your Tradeit Inventory while we check, so it is not at risk.
My item is not in My Tradeit Inventory at all
That is a different problem with different causes, including refunds, pending payment verification, and reversed trades. See Why don't I see my items in My Tradeit Inventory?
