Authentication code

[Bron1]

Just tried to run my weekly class and even though Authentication code is switched off I was required to sign in with code because ZOOM thought I was using a different device which was not the case. I couldnt sign in because it took over 45 minutes for the code to be received by email by which time it had timed out and the class members had given up waiting. All the chat bot suggestions required sign in , which was impossible. Very frustrating and unable to get any help with this issue. Why did ZOOM make me sign in this way out of the blue, and how might I prevent this happening again? It is very unprofessional to let participants down in this way