Amazon Manager Software Development interview questions

The interview was organized in a couple of steps, both the Phone Interview and the Onsite Interview, and a couple of prep calls in between, where they give you instructions on how to prepare for the interview itself.

Five rounds of behavioral interview and a technical review which ended up with the recruiter telling me that I did well, but can't extend the offer. When I asked for feedback, he mentioned the feedback is Amazon proprietary info and cant be shared. That, I thought was strange.