Unable Waiting Room and Noise Bell Notification

Hi, @romanozarina 

Zoom web portal (https://zoom.us ) Settings>Meeting
Sound notification when someone joins or leaves
to uncheck the "Sound notification when someone joins or leaves" option, the alarm will not sound.

In a Zoom meeting, you need to enable either the waiting room, passcode, or "Only authenticated users can join the meeting".

So if you hold a meeting with the passcode enabled, you can hold a meeting without a waiting room.