This message will appear if your call settings require an authenticated user to start the call and manually approve participants.
You will need to adjust the individual meeting settings to allow guests through the waiting room and/or you can disable the waiting room by default for your organization or for specific users.
If 'Everyone' can bypass the lobby and 'Waiting to Join Call' still appears then most likely there is an organizational setting that doesn't allow Guests to start a meeting, only join. This may be adjusted in the Teams Admin Center. This will only happen if no other users are on the call, due to the fact if another user starts the call and there is no waiting room then this message will not appear.
It is possible to authenticate all Microsoft Teams calls on your Airtame Screen, using the guide below.
Click here for how to authenticate Microsoft Teams calls
Click here for best practices for Microsoft Teams
Click here for best practices for Zoom policies