Hey there,
So I just got my app approved for publishing, but I will be using it as an unlisted app. I just tested to see if it was possible to join meetings from an external account and got MeetingFailCode 63.
I should note that my app was approved minutes ago, so not sure if I need to wait a bit of time before it would work.
To give some context, my app is a headless Linux bot build from the meetingsdk-headless-linux-sample.
Thanks