Facebook Creator Studio tab closed before extension finished publishing
This error is caused by closing the chrome tab before publishing finished. Please keep the chrome tab open it will close automatically when publishing is done.
Not logged in to Facebook. Login to Facebook before publishing
Before you can publish to Instagram you have to be logged in to Facebook. Login here
You do not have access to manage this Instagram account inside Facebook Creator Studio
You need to have access to the Instagram business account inside Facebook Creator Studio. This article explains how to fix this.