I agree with this instagrammer that Swedish, Norwegian and Danish are very closely related. As a Swedish speaker I understand Norwegian almost perfectly, and I understand Danish better written than spoken, because the pronunciation is quite unclear compared to Norwegian. It's more unusual that Scandinavians communicate in English than using our mother tongues. Especially Norwegians are good at understanding Swedish and Danish. They watch Swedish television, and they are used to different dialects. Most people (not even Swedes or Finns) don't know that in the area where I live in Finland there are people who speak very old Swedish (!) dialects, even older than most Swedish dialects in Sweden. These dialects have lots of similarities with some Norwegian dialects, and even some similarities with Icelandic, which is one of the oldest Nordic languages.
https://www.instagram.com/reel/CkBajIHIoIL/?igshid=MDJmNzVkMjY=