Workday Scrum Master interview questions

Good pre-interview communication and speedy agreement on date/time. Interviewer turned up on time also. Straightforward and positive initial interview via phone with a manager, which I thought had went well. There was a misunderstanding on their part that I had already had an interview with HR to discuss package on offer (I hadn't). I got a 'Thanks but no thanks' template refusal by email a couple of days later. I replied asking for any kind of more constructive and detailed feedback but none was received. Rating experience overall as negative because feedback is key to the applicant.