Disable audio/video device selection preview dialog when joining meeting

Meeting SDK Type and Version
x64 Windows Meeting SDK version 6.6.1.16446

Description
After I upgraded my app to 6.6.1.16446 (from version 6.3.1.53943), the following dialog was shown when joining meeting. How can I programmatically disable this behavior? The dialog prevent my app from joining the meeting unless a user clicks the “Join” button. This is problematic since my app run in a headless environment.

Error?
No error.

Troubleshooting Routes
I have tried the following two APIs, but they are not the right ones. IJoinMeetingBehaviorConfiguration::DisableShowJoinMeetingWnd(true); IJoinMeetingBehaviorConfiguration::DisableAutoShowSelectJoinAudioDlgWhenJoinMeeting(true);

How To Reproduce
Just upgrade a Windows meeting SDK app to version 6.6.1.16446 and have it join a meeting.