You attempted to add a free third party add-on or custom domain but have been rejected due to having an 'unverified' account.
Credit card verification is a security requirement for the use of third-party add-ons and custom domains. You will not be billed for using free add-on plans even if you have your credit card information on file.
For all account verifications, there is a process to confirm the card being processed. Most often verification transactions are dropped as soon as it's successful, but some banks may take up to 7 days for the pending verifications to fall off. For more information on this please review our Account Verification article.