Instagram's API for posting single images is experiencing intermittent technical issues, which may cause some posts to fail. This affects all third-party tools, and Instagram is investigating.
If you receive an Instagram direct post failure notification then we recommend that you retry the post. If a retry is unsuccessful, we recommend posting via our mobile app publishing workflow. See more information about this workflow here: https://support.sproutsocial.com/hc/en-us/articles/115000683263-Instagram-Publishing
Additionally, Instagram is experiencing an issue sending comment replies from the Sprout inbox. We are continuing to monitor the issue, and will post additional updates as they become available. Please subscribe to receive further updates.