Note: 

To use Webex on the current production versions, please upgrade to Mac OS 10.13 or later.​

Solution:

In order to join a Webex meeting, you must install and enable the Java plug-in.

New installation of Java:

1. Download the latest version from Free Java Download.
2. Open the downloaded disk image.
3. Open the installer within and follow the onscreen instructions.
4. Restart the computer.

Java is already installed:

1. Choose the Apple menu > System Preferences.
2. Choose View > Java to open the Java Control Panel app.
3. Click the Update tab.
4. Click Update Now button and follow the onscreen instructions.
5. Restart the computer.

Note:

• PowerPC-based Macs are no longer supported by Webex.

If you are still facing issues connecting to the session, contact Webex Technical Support.