For enhanced security, your company might require you to set a lock screen on your device if you’re using Webex for iPhone, iPad, or Android.
If you don't already use a PIN, then you'll get a message on your device telling you to enable one.
Webex on iPhone or iPad
Webex on Android
You won't be able to use Webex until you set a PIN.
Enable a PIN from the settings menu on your device.