Certain notifications may not get sent or may be sent multiple times. Notification types that may exhibit this behavior include:
- Collaborator update
- Send preview/download/upload collaboration by email
- Item deleted by collaborator
- Folder comment/mention
- User deleted and content transferred
The root cause is a known issue in the legacy Box notification service. Box is currently updating its notification service, and the issues with these specific notifications should be resolved when they are migrated to the new service.