A Sync Failed error on attempt to sync contacts and calendars

If you get a Sync Failed error when trying to sync contacts and calendars, most likely you didn’t grant SyncMate access to your contacts and calendars on first start:

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To fix this, navigate to System Preferences → Security & Privacy → Privacy and enable SyncMateService for Contacts, Calendars and Reminders (see below). After that, reboot your Mac.

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