API Error: 'The user or site does not support this meeting type.'

Error: 'The user or site does not support this meeting type.' when trying to schedule or start a meeting using APIs.

Cause:
This occurs when the a session type / index number that is not available on the Webex site is used to schedule or start a meeting using APIs.

Solution:

Site Administrators only

To obtain the proper session type / index numbers:

Log in to your Webex Site Administration page.
From the Site Information page, scroll down to the Service Type section.

Find the desired numbers in the Index column, see the example below: