sync Contacts with iCloud
Recently got new iPhone 11and have not been able to sync Contacts on iMac (OS High Sierra) with the Cloud or the phone. Notes and Calendars do sync. I have turned Contacts "on" in Settings>Apple ID>iCloud on the phone but no luck. Followed a link to sync settings in iTunes (which I never use on my phone) but that didn't solve the problem either. Could this relate to being unable to upgrade from OS High Sierra?
iPhone 11 Pro Max, iOS 13