Since the release of Google My Business, Google My Business limits on the maximum number of listings/locations an account can have has changed. Go to Maximum number of listings per account for clarification.
If you are posting to Google My Business Listing that has more than 10 locations (franchise) you may receive the following bounce message "This location belongs to a chain. The Local Post API is disabled for this location" as Google My Business has added limitations depending on when the listings were created.
Unfortunately, listings over 10 locations are not supported via the Google API (what we used to connect).
However, as soon as this becomes available to us we will aim to support it as soon as possible.