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To clarify the problem this is the message I get from [email address removed]:

What happened
 
SCHD1-020 - If Schedule D-1, Line 14 (NetGainLossForm4684) amount is significant then Federal Form 4684 must be attached to the state return.
 
Next step
 
We'll help you update this on your 2021 California Personal return and e-file.
 
 
To update your return
 
Once you've opened your return in TurboTax, the details about what's causing the problem will be displayed.
 
From there we can walk you through making the updates you need and help you e-file your return. If we're unable to resolve the errors and e-file again, we'll help you get your return filed by mail.