Hello @do002th
Thank you for reaching out to the Community regarding your issue, although I am sorry to hear that you are experiencing issues with your credit union. I'm wondering here if our connection might be because of the issue with credit unions we've had. I'll leave a link down below with more information as well.
https://community.quicken.com/discussion/7893969/new-5-17-21-cc-501-errors-returned-for-multiple-financial-institutions
This is about the same time frame but I'm also wondering if you would like to try troubleshooting to see if we might be able to fix the issue let us know and we'll recommend some steps.
Thanks,
Quicken Francisco