Nintendo says it’s making changes to matching with friends in Super Mario Maker 2
Update: Tezuka ended his appearance by saying that an update is planned that will let you play with friends online.
Original: During a Nintendo Treehouse E3 2019 segment, Nintendo’s Takashi Tezuka appeared. He started out by saying that the team will be making some changes to how players are matched with friends. Nothing else was said, but it sounds like you might be able to play with friends online after all.