OpenAI Recruiting Coordinator interview questions

I had a first stage interview with the agency, followed by a second stage interview with a peer interviewer (recruiting coordinator) who seemed genuinely interested throughout. They frequently highlighted my experience, saying things like 'It’s great you have experience in X, that's what we need' etc and closed the conversation with 'I really enjoyed our conversation' which left me feeling hopeful. However, just two hours later I received a rejection with no meaningful feedback. Upon reflection this came across very insincere.

The interview process was pretty simple. However, I did only get to the first stage, so maybe further along it's a bit more difficult. I met with the hiring manager and we talked about my experience.