Contacts not syncing, iPhone > Mac
Contacts entered on my iPhone (5s with iOS 10.2) are not syncing to my iMac (late 2009 with Sierra 10.12.2). or to Contacts in iCloud. Syncing in the other direction (iMac to iPhone) does work, This seems to have been a problem for some time.
• Both devices are logged in to the same Apple ID.
• In the iMac’s System Preferences > iCloud, the Contacts item is checked.
• In the iPhone’s Settings > iCloud, the Contacts switch is on (showing green).
• Syncing from iMac to iPhone does work.
Why then is syncing from iPhone to iMac not working?
iPhone 5s, iOS 10.2