I never would have thought this was an issue, but I read this article in the New York Times this morning about scammers who are crossing the border, selling illegal tours to see the Northern Lights or other activities in Norway; especially in the Tromsø region.
It is evidently a huge problem there, so it certainly pays to check whether your guide in Norway is licensed. One group was with their guide in the car when he was pulled over and arrested, and of course they were probably out the money they paid.
https://www.nytimes.com/2026/05/03/world/europe/norway-northern-lights-tromso.html?unlocked_article_code=1.hVA.5vVj.zvf_XY6hKaNn&smid=url-share (article unlocked)