CalDav and CardDav iOS issues

Solution found:
For my setup the SSL port is 443. Looks like iOS attemps to use 8443 by default.

  1. Generate an app password.
  2. For the server url supply: https://domain.name:443/remote.php/dav/principals/users/yourusername
  3. Enter your username in the username field.
  4. Enter the app password for the password if your account has MFA enabled.
    Profit.
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