My reminders app says I need macOS 10.15 but my Mojave upgrade calls itself 10.14.6.
Reminders app says I need macOS 10.15 but my Mojave upgrade calls itself 10.14.6. Will upgrading reminders cause a sync problem?
iPhone XS
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Yes. See the following from Get ready for the new Reminders app - Apple Support
Upgraded reminders aren't compatible with earlier versions of iOS and macOS. If you upgrade your reminders on your iPhone with iOS 13, your iPad and Mac using the same iCloud account can’t access your reminders until iPadOS and macOS 10.15 Catalina are available. Learn what to expect until all your devices have the latest software.
Catalina is expected to be released in October. See: macOS Catalina - Apple