meetingSettingsHelper.setCustomizedMeetingUIEnabled(true) can't be Invalid

1.Our company wants to customize the Zoom . I used this method (meetingSettingsHelper.setCustomizedMeetingUIEnabled(true)) to implement my own meeting view, but it is invalid.
Start a instant meeting, also jump to the meeting view in the SDK. Can you help me solve this problem?
2.the SDK demo: customuidemo project, it jump to my meeting view, but the activity(ConfActivityNormal) also in the activity stack.
I delete the method of meetingSettingsHelper.setCustomizedMeetingUIEnabled(true), it also to jump to my meeting view。

Your account maybe do not have privilege to use customized meeting UI SDK, please contact the sales.

Where can I see if I have this permission?  thanks

Another problem, I can’t find the contact’s interface in the meeting.