If a reminder isn't showing up on some devices, make sure that you're running the latest iOS, iPadOS, or macOS on each device. Upgraded reminders and shared reminders in iOS 13 or later or macOS Catalina or later aren't compatible with earlier versions of iOS or macOS.Check the system status of iCloud Contacts, Calendars, and Reminders.Check if you still need help after each of the steps below.
