This article describes what the 5665 error code is and how to list products without being brand registered on Amazon. We will discuss what the 5665 error is and explain exactly what the error message is saying. Next, we will describe how to list your products without brand registry in order to resolve the 5665 error. This will include information about what you need to provide to Amazon. We will finish by outlining the basic steps and summarizing best practices for resolving the 5665 error code.