Thank you for reaching out to the Community regarding your issue, though I am sorry to hear that you are experiencing this.
With how long have you been having this issue it seems to be something that might need a deeper look, as such, we would recommend contacting Quicken Support directly for the best assistance. They should be able to look at logs to see what exactly is causing the MFA to fail. I will leave our hours down below so you can find a time that works best for you.
Click here to review Quicken Support's hours of operation. Thanks, Quicken Francisco