I have the same issue for this year's California State Return (2023)
On my turbotax generated form 540, printed on the top is "DO NOT ATTACH FEDERAL RETURN"
This is causing me to lose confidence in e-filing my state return as I'm not sure that my federal return would be attached.
If I have to mail my federal return to the CA FTB, then I might as well file my return by mail and save the $25 state e-filing fee.
