Error when posting to Google My Business:
This location belongs to a chain. The Local Post API is disabled for this location.
You are getting this error because Google does not allow posting for your type of business. Any business or brand with fewer than 10 locations (as determined by Google's internal chain detection) can use API to post on Google. Unfortunately, brands with >= 10 locations are not eligible for posting at this time.
Since this is set by Google and outside Social Report's scope, you will need to manually schedule posts for these profiles.
More information from Google here.