iOS: Suddenly cannot connect to the Zoom meeting

UPDATE

Got this meeting error code: 63 (MobileRTCMeetError)
Based on the documentation, it refers to: Unable to join external meeting

I found a similar topic in the forum: getting-issue-of-error-code-6601-and-meeting-status-meeting-status-failed

Do we really need to publish the app in the Zoom Marketplace? We were able to publish the app in the App Store and use it previously without publishing it in the Marketplace.

Could someone please advise? Thank you.

@chunsiong.zoom / zoom developers