I am encountering this issue also. In my case it's on the Turbotax Premier (Mac) product.
I filed my federal return, a state return (South Carolina) - and still have to file for California.
However every time I open up the app it thinks I have not filed my Federal return, despite going through the whole process of: "Think you've already filed? Select Continue and we'll double-check if you have or not."
Yet every time I go through with this it takes me back to e-file my Federal return, which it subsequently won't accept because it's already been submitted.
Turbotax thinking that my Federal return was not filed is preventing me from filing my California return electronically.
*I received confirmation e-mails already that my South Carolina and Federal return were accepted. Not sure what kind of "double checking" they're doing. I guess it's the kind that is not actually checking at all.
