A joint State Return can't be prepared on its own. It has to pull info from a joint Federal Return.
If you want to file a joint California return, you need the 'Mock' Joint Federal return to transfer the info to the Joint California return (since you filed Separate Federal returns).
If you use the TurboTax desktop product, this is much easier to accomplish, for both Federal and State returns.
Click this link for more info on Preparing a State RDP Return.
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