Hello, I am trying to add interest income from my savings account with Marcus: by Goldman Sachs (separate from Goldman Sachs), but it's not on the list. Can anyone help?

If your financial institution isn't included on the list, you can choose to enter the interest income information manually.  On the screen where you can enter the financial institution name, scroll down and select the "I'll type it in myself" button.  See the sample screenshot below.  On the next screen you can enter in the name and the interest income amount. 

Does not work for me either. Please fix or I'm moving back to H&R block next year. Never had such issues with them.

Also, these are all supported since they appear in the TurboTax list (at least I'm assuming so, otherwise why add them to the list?)