Looking it up, it has the same rule as Germany: If your "center of life" is in Norway (roughly: spending more than 6 months out of a year there), then you have

Looking it up, it has the same rule as Germany: If your "center of life" is in Norway (roughly: spending more than 6 months out of a year there), then you have to pay your taxes. That is not what the US does which is "We don’t care what you do and where you live, if you have citizenship you better file your taxes"