Microsoft Software Developer - Internship interview questions

The hiring process starts with an initial phone interview or on-campus interview which could be either behavioral(mostly phone interview) or coding(on campus) interview. If you qualify the first round, the next few rounds will be onsite at their Redmond campus. It will be a series of 4 interviews with different teams in the same domain eg. cloud and enterprise - SQL server, Azure storage, etc

Applied through a career event in our university. A week after got an email for on-campus interview. Interviewer seem to be not happy to being there. There was an easy linked list question which I solved and a few straightforward behavioral questions. No resume related talk. Interview wasn't selective at all. I'm not sure how they filter down depending on these questions. I would expect more sensible and challenging interview from Microsoft. After 4-5 days from the interview, they emailed generic rejection.