Thank you for taking the time to visit the Community to post your issue, although I apologize that you haven't received a response.
I have taken the liberty of reviewing your online biller account for Citi and I do not see any sync errors occurring.
I do see that you have two Citi bills, which bill in Quicken is having the issue, or is it both?
Are you refreshing the bills from the Bills and Income page or do you rely on the One Step Update process to update them?
Please let me know!
-Quicken Tyka
Thank you for the response although, I apologize that this issue continues to persist.
At this time I would recommend contacting support directly by phone on Monday for advanced troubleshooting steps. https://www.quicken.com/support#contact-support
Quicken Care has the tools to review and research this issue further.
Thank you,