The Zoom API returns us a link of the form https://zoom.us/s/{meetingId}?zak={zak}. On iOS, when you click this link, you get redirected to Safari and then need to manually open the app to start the meeting. It should automatically open the Zoom app though.
Looking through Apple’s AASA (apple-app-site-association), only links with Zoom that start with /j are registered to open the Zoom app. But recently Zoom switched to having start_url start with an /s, breaking this.
Is the Zoom team aware of this? Is there a workaround?