Hello @John Salay,
Thank you for reaching out to the Quicken Community to share that you are experiencing this issue.
We do have an active alert regarding users receiving QCS-403-1 errors during OSU/Sync. You may follow this link to access that alert where you may bookmark it in order to remain up to date on any new information, ETAs, or resolutions that may occur. If you do not see the option to bookmark the alert, please make sure that you are signed into the Quicken Community.
We do apologize for any inconvenience caused in the meantime.