Check product inventory in Seller Central
Step 1 Open Seller Central.
Step 2 Choose inventory.
Step 3 Choose Manage all inventory.
Step 4 Search your product by SKU, then press Enter.
Step 5 The status of your product should be Active. Products with no inventory have an Inactive status. Check for any notes related to other reasons for Inactive status.
Step 6 Check the Available column for inventory count. It should be more than zero to offer Buy with Prime.
Learn more about how to manage your Amazon inventory.