Thank you for
reaching out on the community and telling us about your issue. I do apologize for the issue you're having. I was taking a look and the information in the other thread is correct with what the bank has for sign in information. The link for that can be found down below.https://www.capitalgroup.com/individual/service-and-support/other-resources/how-to-use-quicken.html
What exactly does the error say when trying to connect? One thing I might recommend as well would would be to contacting the FI to see if they're able to guide you with setting up your accounts. Either way let us know a bit more info when you get the chance!