ISSUE
When attempting to start a Webex meeting, users may encounter an error message stating "atmgr.exe - Entry Point Not Found." This error typically prevents the Webex meeting application from launching, hindering users' ability to join or host a meeting.

RESOLUTION
Follow the steps below to resolve the issue:

1. Uninstall the Webex meeting software, see:
   • WBX19806 - How Do I Uninstall Webex Software on Microsoft Windows?
2. Reinstall the Webex meeting software manually, see:
   • WBX21270 - How Do I Download the Webex Client?

If the steps in this article do not resolve the issue, please contact Webex technical support.

CAUSE
The "atmgr.exe—Entry Point Not Found" error usually indicates a problem with the Webex meeting application's executable file on the user's computer. This could be due to a corrupt or incomplete installation, an outdated version of the software, or conflicts with system files.