Contacts disappear immediately after creation
I add a contact (Firstname, Lastname, Phone, Email) and save it.
After a few seconds, presumably when macOS tries to sync it to Gmail and/or iCloud, it disappears.
I have a Gmail account and an iCloud account, when I add the contact via the Android app, it stays in the Gmail address book and it gets synced into macOS.
What can I do do make macOS contacts work again?
MacBook Pro (Retina, 15-inch, Mid 2014), macOS High Sierra (10.13.2), contacts