How to configure a Pinterest content sources
To bring in the content from a brand's Pinterest presence, you cannot simply search for the name of the brand. You have to enter specifically the URL to the brand's Pinterest account directly, or enter the name of the Pinner managing that brand account.
The easiest method is to find the Pinterest URL of the account you want, and paste that into the Pinterest user/board name field in the Pinterest field in the app 'wizard.'
For example, in the screenshot below, entering the Pinner's name reliably provides the specific company/brand name. Searching for the name doesn't necessarily always reliably return the company/brand name.
The Pinterest content source will return all Pinned content, from all boards managed by that company/brand. It is a good way to pick the "best of" Pinterest content across multiple boards.