Amazon Pathway Operation Manager interview questions

The interview was to be structured over 4 successive interviews contingent upon getting past the first two, after which you will be referred for the last two. The first interview was supposed to be online through Amazon's collaboration software Jabber, but my interviewer called me and conducted a phone interview instead. After the phone interview was over I received a video call from the second interview shortly after. Both interviews were approximately 30 minutes each and was not extremely difficult. The next day I received an email stating I would not make it to the next phase of the interview process.