iPhone can't verify CalDAV account I am using Google Calendar and I would like to sync it with my iPhone. Usually, the best way to do this is via setting up a CalDAV account which I've been successfully doing for a while. 

However, recently, the syncing has ceased to work. So have I subsequently deleted and re-added the account to my iPhone, but I keep on getting an error message, that the CalDAV account cannot be verified.

Does anybody have any suggestions what I can do about this? I'm absolutely certain the all the data I enter is correct.
The answers provided helped me resolve my CardDAV verification issue.  Here are the exact steps I took:


Sign in to your Google Account at:   https://myaccount.google.com/
In the Sign-in &amp; Security section select:  ‘Signing in to Google’
Select ‘App Passwords’
From the dropdowns:  Select the app (contacts) and the device (iphone)
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.