I had the same problem. I logged into Schwab and selected the "service tab" and scrolled down to "security". It gives you the option as shown below which allows you to link with your turbo tax
Third-Party Access to Account Information
You can provide third parties, like tax preparation programs, access to your account information at Schwab.Enabling access may impact the privacy and security of your accounts. If you choose to share your login credentials with third parties, their activities in your account will be considered authorized.
Enable Third-Party Access
You are enabling access to your account information through this channel (OFX protocol). Access will be enabled with your login ID and password alone, even if you have activated a token or other two-factor authentication method.If you share your credentials with any third-party to access your account information, their activities in your account will be considered authorized.
Disable Third-Party Access
You are disabling access to your account information through this channel (OFX protocol).
