Personally - and this is just me speaking for me - I'm not overly worried about the mismatch by entering zero. I say this because the $500 is legitimate and on the Federal Form that was accepted - thus the Federal refund is correct as submitted. What I also observed was that adding zero on the 1040 form for the CA return had zero impact on my CA refund - it was the same amount with or without that amount entered. So, it's a minimal amount; with no impact on my state return anyway - other than they actually accepted it!
Having said that - I'm done with my 2021 taxes - but TurboTax may not be at the top of my list for my 2022 taxes next year with this type of non-service/support.
