iPhone Calendar not syncing
My iPhone is not syncing with iPad
iPhone 6 Plus, iOS 12
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Check that calendar is enabled in iCloud settings on both devices. Settings>Your name>iCloud>calendar.
Check to to see if iCloud is set to the default calendar on both devices. settings>calendar>default calendar
Make sure both devices are using the same Apple ID.
Check icloud.com to see if the calendar is updating there.