I’m working on a web app project which make the user request to join zoom webinars. we created a webinar on Zoom with the registration is required, and we use add webinar registrants API to add the user and get his join_url. Later on the user receives an email with link, once the user clicks on the link, the user is redirected to a webpage which has the zoom webinar window. If the user tried to open the link from an iPhone, the zoom webinar window inside the webpage ask the user to enter the passcode. If the user clicks on the link from an Android phone or laptop, the user will be redirected to the webpage and the webinar window inside the page would work and wouldn’t ask for the webinar passcode.