Some contacts in Mail are greyed-out
Hello I'm using a Mac Studio running Ventura 13.1. I don't own or use an iPhone or use iCloud.
The contacts were imported from my old iMac by creating an .abbu file. This was imported into Address Book, where they all show up normally.
However...
When I compose an email, a lot of my contacts aren't available to use. They are visible, but greyed out. Even if I search for an email from one of these people and select "add to Contacts" they still remain greyed out.
What is going on?
Mac Studio, macOS 13.1