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Control Hub cannot set the Webex voicemail lockout from (3) to a higher number. The solution is that the user has to reset the voicemail PIN after entering the PIN incorrectly three times. This setting is by design.

For the Site Admin: Use (admin.webex.com) to reset the pin.
For Individual Users: Use (settings.webex.com) to reset the pin.

Reset a user's voicemail PIN in Control Hub:

Site Admin View:

1. Go to https://admin.webex.com.
2. Go to Users and select the user to reset the voicemail PIN.
3. Select Calling and then choose Voicemail from Voicemail, fax, and announcement language. 
4. Enable the Voicemail toggle, and then select Voicemail PIN.
5. Click Reset Voicemail PIN. 

1. Go to https://settings.webex.com and select My Profile.
2. Click the "…" and select Reset Voicemail PIN.
3. Enter your New Voicemail PIN.
4. Re-enter your PIN in Confirm Voicemail PIN and click Save.