Nonresidents: If you were not a resident of North Carolina at any time during the tax year 2019 but you received income in 2019 from North Carolina sources that was (1) attributable to the ownership of any interest in real or tangible personal property in North Carolina, (2) derived from a business, trade, profession, or occupation carried on in North Carolina, or (3) derived from gambling activities in North Carolina, and your total gross income from all sources both inside and outside of North Carolina equals or exceeds the amount in the Filing Requirements Chart for your filing status, you must file a 2019 North Carolina individual income tax return, Form D-400.
it appears NC does not tax telecommuters. (those that work from home for companies located in a nonresident state)
read item 2) above "carried on in NC". since you say you had no physical presence in NC, i would conclude that you don't need to file a return for that state.
