Update with no warning forcing two step authentication

My daughter called me, home alone, letting me know there was a strange truck in the drive. Man got out of truck and rang the doorbell. I said, "No problem. I will answer on the app." Only I couldn't. The app forced me into the two step authentication, and I couldn't answer the doorbell ring. It captured no video, just 40 seconds of black, when the person rang the bell, so I still don't know who it was.