Why am I not seeing some of my local contacts in the Mac App?

Currently, FullContact for Mac only syncs with the Contacts default account on your Mac. 

To view or change your default account on OS X Mountain Lion (10.8) or later:
  1. Open Contacts 
  2. Select Contacts > Preferences (top left of your screen)
  3. On the General Tab, see what account is listed as the default

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