Never mind, I figured it out. It's a TurboTax bug.
When you use the MacOS password manager to look up and enter the password for the Schwab account, it enters the password into the field, but the window doesn't seem to recognize that anything has been typed there, and so it doesn't "unlock" the Continue button. I got around it by placing the cursor at the end of the password "dots" and typing one additional character, then deleting the additional character. That will turn on the Continue button and you can go forward.
TurboTax: You should fix this, I am sure I'm not the only one stuck and frustrated over it.
