I received a bill from the franchise tax board for year 2021. I looked over the return I filed and I don’t see what the discrepancy could be. How can I figure this out?

I spoke to them and they said I omitted some of our income on the state forms but not federal. This was an accident, but why did it take 4 years to figure that out?

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Only the FTB can answer why it took 4 years, and what was found that wasn't reported. However, did you independently verify the phone number before calling by going to the FTB website to make sure the bill is not a scam?