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"Contacts" application does not start on Mac OS 10.15.7
MacBook Pro 13″, macOS 10.15
Open (Apple menu) > System Preferences... > Internet Accounts
Determine which, if any, of those accounts use Contacts. Perhaps one or more of them are misbehaving. You can de-select Contacts and see if that changes anything. Other than that I'm out of ideas other than to reinstall macOS: Reinstall macOS - Apple Support.
I understand the Contacts app does not launch.
Please determine if the same problems occur in "Safe Mode": How to use safe mode on your Mac.
Yes, it doesn't start in safe mode either
"Contacts" application does not start on Mac OS 10.15.7
