Apply to sell – Approved – Not available

I applied to sell an item and got approval after sending it my invoice. then when I went to list it says not available? any idea what to do. should I just return the product. Amazon said if my account was able to sell there would be an apply to sell button. And there was and I was approved and now I cannot list and have inventory on hand. any advice? I am new and have only 3 items approved that are inbound to the fulfillment center now.