Relativity Space Mechanical Engineer interview questions

Applied online and was contacted by technical recruiter for my availability. I submitted my availability but never received a calendar invitation or confirmation, and when the recruiter called I was not available to talk. The recruiter apologized and offered to call back a few hours later. A few minutes before the rescheduled interview, the recruiter texted me asking if we could move the interview to the next day instead, and I accepted. Didn't hear back after that, and tried following up multiple times but I guess I've been ghosted.