You may encounter webview loading issue in mobile device for ChatPion Ecommnerce or WebView Form. When clicking on button, that doesn't trigger the webview & nothing happened in mobile but working fine in Desktop.
It's actually a issue happened randomly & can be fixed very easily.
Go to Facebook pages Settings -> Messenger Platform/Advanced Messaging -> White Listed Domains ,
Then if already your domain is there, remove it & put it again with https & save. It should solve the issue. If it subdomain, then put the subdomain also .
Then try bot reply again & click on webview button, it should work.
Xerone IT Team