> We were a victim of a teleconference or Zoom hijacking and we are trying to understand what we need to do going forward to prevent this from ever happening again

I don't know if there are more details elsewhere, but I feel like a solution here is to not host the meeting in such a way that allows others to share anything (or at least only allow authorized users to join)? Although I would think that a 'broadcast' of the meeting followed by text-based follow-ups from people not physically present would be an even better system.

Maybe there are more requirements that I don't know about.