You can post a notification banner for all users in a market to see when they log into Business App.
You can use this to announce a promotion, share an important link or video, or give a status update that might be important for all your clients.
How to publish a banner
1) Navigate to Partner Center
2) Click on Administration > Customize Business App
3) Go to the Notifications Tab > Global notification banner
4) Add your message and expiry date. This message will appear for users until they dismiss it or it expires.