I have been receiving the CC-502 error over the past few days when trying to reconnect my CC account at America First Credit Union. I am not receiving transaction downloads for any of my accounts at this institution, so I decided to disconnect and then reconnect. This has been happening over the past week or more, and followed the OL-295-A error that I was receiving, which has now disappeared.
All of this follows issues with Quicken software after I reported a bug, that was ultimately corrected.
[Edited Readability]