Duplicate me.com accounts in Contacts
On my 27 inch iMac, Contacts shows me with two identical me.com accounts and many duplicated records. If I amend one record it updates the corresponding one but this slows down my system.
The iPhone and MacBook pro do not have this problem, so it is peculiar to the desktop.
In desperation I exported all my cards to an archive, but this did not solve the problem.
I now cannot re-import the archive because, with all the duplicates, the size of the file (8400 cards, 12MB) exceeds the Apple limit.
Any ideas please? Apple help spent half a day on this last year with no result.
iMac 27″, macOS 13.3