On April 24, 2018, Facebook announced that they were removing the publish_actions Facebook API permission.
The publish_actions permission was required to perform offline publishing of Facebook posts to personal Facebook profiles and Facebook groups. Offline publishing means “without user intervention,” such as future-dated Facebook posts scheduled in our service and other comparable services.
The removal of the permission means that we will now be able to publish your scheduled posts only to Facebook pages of which you are an administrator. We cannot any longer publish posts to Facebook profiles and groups.
This change affects all third-party services that use the Facebook Graph API.