The Quicken error CC-506 occurs due to the changes in financial institution details, or the bank account is closed. The other reason behind Quicken error CC-506 is the activation of the old account in the file but unavailable with the financial institution. To fix this problem first, you need to update the Quicken to the latest version, and that can be done from the Tools menu and click on a one-step update. Secondly, you will have to refresh your account details by opening the transaction register in Quicken application. Now you need to click the action icon on the top right corner and then click on Update Now. Further, you will have to follow the on-screen instructions to fix the Quicken error code CC-506.