I have duplicates on iCloud.com also. Says to contact Apple support. That page leads back to same page as earlier. How do I get rid of duplicates
How do I delete contacts that are on devices but also on iCloud.com?
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If you have signed in with same Apple ID and password on the same network in Mac and iPhone or other apple devices the contacts on each device will get synced , if the same contacts are in devices they will be seen as duplicates ( as if you had already created contacts in Mac and the same are in iPhone ) .
To avoid it , disconnect the desired device by just signing out from Apple ID account , then delete the duplicate contacts in each device .
See the thread https://discussions.apple.com/thread/252528149