I appreciate the steps you've already taken to resolve this. Since the error persists even after you've verified your information, I recommend checking the Bank feed status page to see if there's an ongoing issue. If everything looks clear there, try signing in to QuickBooks using an incognito or private browser window to help rule out browser-related issues. If the issue continues, perform the additional browser troubleshooting steps.
If the error still doesn’t clear after that, the best next step is to contact our live support team so they can take a closer look and help you move forward.
You can revisit this thread if you have follow-up questions.