[doktrin]

That UD link actually does leave some wiggle room for dual citizenship :

"Although Norwegian law is based on the principle that dual citizenship is not acceptable, Norwegian authorities cannot answer for what legislation in your home country says about citizenship."

"In other respects than in the abovementioned No 1 and No 2 dual citizenship is allowed."

In my case, I was born and raised (mostly) in the US with a Norwegian father who is still a Norwegian citizen (permanent work visa). Therefore, I have held dual passports since I was a teenager and submitted the formal application for full citizenship when I turned 18.

While a lot of work was put into my application, including references from family and friend, I believe the most important element, from a legal standpoint and otherwise, was my immediate family.