You may have an external guest coming to your zoom meeting. If you have authenticated users turned on; as long as your guest has a verified zoom account, they will still be able to log into your meeting. Currently, an authenticated zoom account does NOT need to be a Lehigh account.
If authenticated user is turned off, you can use Zoom without logging into a Zoom account as an anonymous user.
You can change options for all your meetings or at the meeting level. For secure meetings, the recommendation is to change for an individual meeting only.