I believe this has been covered - Primogen only have jurisdiction over members of their own Clan. Yes, I know Noble says: “While you possess Noble status, you may award any individual the fleeting status Acclaimed or Loyal without expending this status.”
However, Jurisdiction rules still apply.
"Unless otherwise stated, all uses of status (passive bonuses or active expenditures) must target characters who have
been within the jurisdiction of the individual expending the status within the last 30 days.
A Primogen’s authority includes: “…Holding jurisdiction over members of her clan who have recently visited or dwell within her Prince’s domain.”
Ergo, Primogen can only use the spend power of Noble (to assign Vulgar) to members of their own Clan who have recently visited or dwell within her Prince’s domain.
However, an Elder’s jurisdiction is much different. Cornelius can apply negative status to anyone he’s physically interacted with in the last 30 days.