You may have an inventory storage limit. Inventory storage limits generally apply to new FBA sellers and existing FBA sellers with slower-turning inventory. If your Amazon FBA account is configured for Unlimited storage: One of the items in the Preview may have an ASIN level capacity restriction. The ASIN may also be in a gated category or a restricted brand. Unfortunately, Amazon does not tell us which item is causing the error.
If you are getting this error while you are listing the product, you can list the item via Merchant Fulfilled, or contact Amazon Seller Support for specific inquiries about the ASIN