I feel very good, the questions asked in the interview are very in-depth, and the interview manager is very kind, but I failed, and regret that I can't work together

First I had a simple phone interview, then the technical test was scheduled. After more than two weeks, I got a response saying I didn't pass the test with a copy and paste text and nothing else, no feedback or explanation. I send an email asking for it, and it came back after a week.