all my contacts have duplicates
How can I eliminate duplicates in Contacts in
iCloud and on my apple devices?
MacBook Air 13″, macOS 11.2
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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 article https://support.apple.com/en-in/HT203565
When Apple ID is signed in Mac and application contact is turn as on https://support.apple.com/en-gb/guide/mac-help/mh36834/mac
If you select duplicate contacts from Mac and delete them , automatically they will be deleted from iCloud.com