Not at this time. Waiting Room is a new security feature that is turned on for all Amazon Chime meetings and all hosts.
Amazon Chime's new Waiting Room adds another layer of privacy to all your meetings. Anonymous users that attempt to join your meeting are sent to the Waiting Room until you or another attendee from your company admits them in. Registered and signed in attendees who are invited still receive auto-calls and join your meetings without going through the Waiting Room.
If your hosts are expecting external attendees who may be new to Amazon Chime to join your meetings - make sure that at least one attendee from your company joins with an Amazon Chime Windows, macOS, web, iOS, or Android client so they can Admit you attendees.
If your hosts need to provide ways to conduct meetings where no one is joining with an Amazon Chime client, we recommend setting up Moderated meetings and providing the meeting passcode to trusted anonymous attendees.
Visit https://amazonchime.zendesk.com/hc/en-us/articles/38960003661979-Creating-a-Moderated-Meeting for information regarding setting up Moderated meetings.