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Solution:

To resolve the issue:

1. Ensure you have installed Productivity Tools on your computer. For help with downloading and installing Productivity Tools, see: Install and Set Up Webex Productivity Tools for Windows.
2. Enable or activate the Webex Integration Add-in if it is disabled or inactive. To enable or activate the Webex Integration Add-in:
   1. Open Microsoft Outlook, click the File tab, then choose Options.
   2. Click the Add-ins button.
   3. Check if the Webex Integration Add-in appears under Inactive Application Add-ins or Disabled Application Add-ins in the Add-ins box, then do one of the following:
      • If it appears under Inactive Application Add-ins, select COM Add-ins from the Manage drop-down, then select Go...
      • If it appears under Disabled Application Add-ins, select Disabled Items from the Manage drop-down, then select Go...
   4. Do one of the following:
      • If you have selected COM Add-ins from the Manage drop-down, check the Webex Integration box on the COM Add-ins window and select OK.
      • If you have selected Disabled Items from the Manage drop-down, highlight the Webex Integration entry on the Disabled Items window and click Enable.
   5. Exit and restart Outlook.

3. Try uninstalling and re-installing the Cisco Webex Productivity Tools App, then restart Outlook.