Hello @dave344
Thank you for reaching out on the community and telling us about your issue. When it comes to connecting to a Merrill Lynch you should be able to do so when adding an account. Go to Tools -> add account -> Brokerage. It should show up under Merrill Lynch Investments. Once you do this it will ask you to sign in and it might pull up an error message saying It's not you fault. At this point keep quicken open but go to Merrill Lynches website and sign in. The bank might have a message asking if you'd like quicken to be able to connect to your Merrill Lynch account. I don't recall if this is a popup that appears when you sign in or if it's a secure message in your inbox. Once you do that you should be able to try again to connect and see if it lets you connect. It'll be a bit different than before and hopefully should let you through to adding your accounts into quicken.
Please let us know if this helps resolve the issue for you.
Thanks,
Quicken Francisco