it was discovered that when discussions in a course are blacked out in the studio advanced settings, mobile app users can still post
If discussions are closed and blackout dates are set in studio
No Add post button exists in the course on edx.org
+Create a new post button/add a response/add a comment should not appear in the mobile app.
+Create a new post button does appear in the mobile app when the discussions are blacked out.
Ready for QA