Slack Tech Support interview questions

Email received from hiring rep to say they would be interested in my application. The rep then sent me a list of questions to answer asap about past experiences I've had in the workplace. I answered each question in a relevant way to my knowledge, checked for spelling mistakes and returned the test that same same day in plenty of time. Received an email from the recruiter using a do not reply address informing me they decided not to take me to the next stage. Hard to know what went wrong exactly when I spoke to nobody personally.