The user hasn't authorized the application to perform this action or The Application Is Not Authorized
When you receive this error message, it is most likely because you edited or removed one of the permissions Sprout requires in order to post content to your Facebook page. In order to correct this, please log in to your Facebook page and go to this link: https://www.facebook.com/settings?tab=business_tools
Find Sprout Social in the list of applications and check the box next to it before clicking Remove. You will then need to go back into Sprout and try to reconnect a Facebook profile or Facebook Company Page to go through the authorization process.
Ensure that you click Okay on all of Facebook's permissions prompts; otherwise, Sprout will not be able to work with your Facebook profiles or Pages correctly.