Quicken error cc-506 occurs while trying to access the Quicken account but can’t due to changes in the financial institution. Quicken error code cc-506 depicts that either your bank account is closed or the account number has been changed on your bank’s website. To eliminate the problem you will need to take the following steps.
1. Firstly, you must update Quicken with the latest patch.
2. The next step is to refresh the existing account details on Quicken.
3. If the above steps do not work then deactivate the account and then reactivate it again.
4. If nothing worked out then contact the Quicken experts.
https://www.quickensupporthelpnumber.com/blog/fix-quicken-error-cc-506/