This error happens when your bank has an “Unsupported multi-factor authentication” method. What that means is the security on your bank’s site is too secure to connect to third party sites. In order to add your bank to EveryDollar, you’ll need to disable any extra security you have on your bank’s site. If you can’t do that, you won’t be able to add this bank to EveryDollar.
With this particular error we always recommend reaching out to someone at your bank to let them know the high security is keeping you from adding your account.