This solution doesn't work on MacBook Air Contacts Program (OSX Monterey).

All contacts are on iCloud. I have no contacts "On My Mac"

It says

iCloud

then

All Contacts

then below the highlighted "All Contacts" in the photo below are the various groups I've created - none refer to On My Mac or iCloud.

After going to System Preferences --> Apple ID --> iCloud and unchecking "Contacts" and returning to Contacts, there are NO contacts (cards). See photo.

Logged out of iCloud. Still same as photo above.

Restarted in safe mode (still logged out of icloud). No contacts show up at all.

Quit contacts app.

While in safe mode, logged back into iClud via Apple Menu - System Preferences - Sign In

Upon Sign In Contacts was automatically checked.

Ran Contacts App - again while Mac in Safe mode.

Took a bit of time but the approximately 1000-1100 contacts I have in iCloud all populated into Mac's Contacts program. And, they're listed under iCloud --- All Contacts. There is no listing of "On My Mac"

Number of cards/contacts (approximately 1000-1100 contacts) in Mac's Contact's program matches the (correct, non-duplicated) number on my iPhone and in iCloud.

While running in safe mode on the Mac, there are no contacts (duplicate or otherwise) that I would wish to delete/merge/etc. either on the Mac (under iCloud --- All Contacts), in iCloud, or on the phone (which also syncs to iCloud - and only iCloud - under same username). In safe mode - everything looks "right" between Mac - iCloud - iPhone.

So, while in "Safe Mode" the duplicated contacts seem to be "gone" Again, the approximately 1000-1100 contacts I have in iCloud all populated into Mac's Contacts program. And, they're listed under iCloud --- All Contacts. There is no listing of "On My Mac" in safe mode on the Mac, there are no contacts (duplicate or otherwise) that I would wish to delete/merge/etc.

But, obviously, don't want to have to run Mac in Safe Mode all the time...

So, now what?

Will put up another post after restart in regular mode (e.g. not safe mode).

Also observing that the Find Duplicates command is not eliminating duplicates. Rather, just keeps the duplicate card and for each duplicated card has the same info repeated over and over and over again. So, it seems to merge the cards' data into the card over and over again. What a waste!

Did NOT log out of iCloud before shutting down from Safe Mode.

Shut down while in Safe Mode.

Started up in non-safe mode.

Was still logged into iCloud when computer started up in non-safe mode.

Ran contacts app.

Same number of contacts/cards (approx 1000-1100) on Mac Contacts (as well as iCloud and iPhone) as when ran in safe mode. No obvious duplicates.

While it appears this is "fixed" - I'd be interested in knowing WHAT amoungst the abovementioned steps got rid of the duplicates and how/why. Was/is there a file somewhere on iCloud, iPhone, Mac that holds some sort of old/residual contacts/cards that the Mac Contacts program was pointing to and pulling duplicate cards?

I appreciate the procedure and that it worked. But, I have to say, the BY FAR MOST IMPORTANT reason for having my iPhone and Mac is the storage of contacts (with far more than just name, address, email and phone information). I've owned Mac's since the original Mac (and before that, Apple 2+) and have since Palm Pilot days, have sought to keep contacts sync'ed between the Apple device and the handheld device. Contacts and sync are the #1 reason and #1 source of problems for me. Definitive ideas, answers and reasons are appreciated.

Thanks.

Also, deletion of contacts on the Mac in Contacts doesn't "stick" - after a few moments/minutes, cards reappear after deletion on the Mac.