iPhone can't verify CalDAV account
The answers provided helped me resolve my CardDAV verification issue. Here are the exact steps I took:
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Sign in to your Google Account at: https://myaccount.google.com/
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In the Security (used to be Sign-in & Security) section select: ‘Signing in to Google’
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Select ‘App Passwords’
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From the dropdowns: Select the app (contacts) and the device (iphone)
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Follow the instructions in the pop-up to enter the verification code as the password for your google account on your phone.
I have IOS 11.4.
CardDAV Error with the iPhone is related to the 2 factor authentication. You need to log into your Google Account - settings and choose signing into google.
Generate an app specific password - this password you utilize on the iPhone and everything should sync.