Waiting Room is a security feature that is turned on for all Amazon Chime meetings.
You cannot turn off the Waiting Room when scheduling your meetings or for all your meeting hosts.
The Waiting Room can only be turned off after the meeting has started but a host/delegate/moderator.
If you want to allow everyone in without requiring the Admit action for each, the host/delegate(s)/moderator(s) can choose Turn off Waiting Room from the More (...) menu (NOTE Authorized users do not have this host control).
View the Amazon Chime User, Administration Guide and API Reference on the AWS Documentation site.
Find more information about the Amazon Chime solution, pricing, customer references, getting started, and other resources.