Hello @Hendie Thank you for reaching out to the Community regarding your issue, though I am sorry to hear that you are experiencing issues adding your account.
With adding the account there may be multiple connections that could work in order to add your TFSA account. As such we would recommend contacting Quicken Support directly for the best assistance so they can guide you through figuring out what could work on getting the account added into Quicken. 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