Zoom Iframe can't start webinar in iphone

[otex_backend]

the webinar stop in first step which ask about name although i insert the name

<iframe allowusermedia sandbox="allow-forms allow-scripts allow-same-origin allow-popups allow-popups-to-escape-sandbox allow-top-navigation" allow="microphone *; camera *;" style="border: 0; height: 100%; left: 0; position: absolute; top: 0; width: 100%;" src="https://zoom.us/wc/12345678/join"  frameborder="0"></iframe>