How do I sync in-app notifications for all users in Fusion Applications?

Run the Synchronize Notifications in Global Header scheduled process on a regular basis. In the global header or Home with Ask Oracle, for example, it removes notifications older than 30 days or already acted on elsewhere, say from email or by other approvers.

You need the Manage Scheduled Job Definition (FND_MANAGE_SCHEDULED_JOB_DEFINITION_PRIV) privilege to run this process.

1. In Scheduled Processes, click Schedule New Process.
2. Leave the type as Job.
3. Search for and select Synchronize Notifications in Global Header.
4. Use the Advanced option and schedule the process. It’s recommended to run every two hours. You can run more often depending on the volume of approvals, but never more often than every 30 minutes.
5. Submit the process.

The process might take hours to finish if it's running for the first time or hasn't run in a long time.