@hudspethofs We need more information to be able to better assist you. Where is the email you received from? And provide more details about the request. What state are you filing taxes? I found some information below but am not sure it is relevant to your situation.
The only information I can find on the D400 form is related to North Carolina state taxes. The Form D-400, Individual Income Tax Return Main Form is the tax return you file for the state of North Carolina. It is estimated to be available for filing on 02/17/2022. And that form is not available yet.
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