1) It isn't in your own documents...The D-400 is the NC form that TTX has to fill out for you to send to NC when you complete filling in all your information/income/deductions/credits etc.
2) Only the Printed final form D-400 is available i.e. only if you decide to print out your NC tax return, and file it yourself by mail....the notice was extremely poorly worded about that.
The current list of state forms for E-filing indicates you cannot E-file your NC tax return until 24 Feb (or later).
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IF you want to see what the D-400 looks like, you can get a copy here (instructions are the D-401):
Individual Income Tax Forms & Instructions | NCDOR
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
