Amazon Product Manager interview questions

GES Startup Project Manager. 4 months post app, I was invited to complete an online assessment which consisted of a combination of questions and recorded responsed. Passed the assessment and then was invited to 1:1 with the hiring manager. Passed the interview and was invited to complete a written assessment of a previous innovative project. Passed the written assessment and was invited to the loop interview consisting of 5 different back-to-back 1 hour rounds (6 people). I literally do not believe I could have handled it better - I had 20-25 stories from my work past and was able to make them translate to all of Amazon's Leadership Principles. Felt genuinely good about the interview, but was called 3 days later stating they were not moving forward. Felt like a gut punch after so much preparation.