Please try to Reset Sync so that the current cloud sync file is replaced with a fresh complete copy Do note that a full Sync process may take many minutes to complete.
Log out of your mobile app, then do this on your desktop / laptop:
How to reset Sync to Cloud
If you haven't done so already, I'd say it's time to call Quicken Support on the phone and request help. Let them do a screen share session with you to review a download log file on your computer, to determine the nature of the problem and to figure out how to fix it.
Quicken Support:
Hello @Widetrack
Thank you for reaching out to the Community regarding your issue, although I am sorry to hear that you are experiencing issues with your sync. I'm wondering if you mighty not be connecting to the server properly with the error you're getting. One thing we can attempt here real quick is to see if we might be able to fix the issue by signing in and out. I'll leave steps down below.
Once you get a chance to try these steps, please let us know what you find. From there we'll better understand our next steps/options.
Thanks,
Quicken Francisco