North Carolina's visiting-student rule, 21 NCAC 36 .0233, targets students who are not yet licensed. In that case the request comes from the hosting North Carolina agency, signed off by its chief nursing administrator or an RN they designate, and it reaches the Board 30 or more days before the clinical. It carries the home-state board's approval, the coordinating faculty member's CV and RN license, proof that whoever supervises on site is an RN licensed in North Carolina, and the school's licensure from the University of North Carolina Board of Governors (G.S. 116-15).
Doctoral students fall outside all of that. NCBON's education FAQ says the Board takes no approval role for post-licensure graduate education from any state, and it lists RN-BSN, graduate and doctoral programs among those beyond its reach. What NCBON does ask is licensing-related: a graduate student with no North Carolina license and no multistate license should reach the Licensure Department through the Board's online form for the clinical requirements. The state has been in SARA since June 2016, which NCBON says can let students at SARA-approved schools complete clinicals in North Carolina.