Are you still experiencing this issue? Form 1116 Schedule B is definitely available and many users have reported being able to successfully file with the form included. If you have checked for updates as mentioned, you may want to try uninstalling and reinstalling your software. I have included those steps below @SalQ .
How to uninstall Turbo Tax for Windows
How to reinstall Turbo Tax for Windows
How to remove and reinstall Turbo Tax for MAC
