What you need to do is whenever both you and a friend is online and playing animal crossing, head to the airport and tell the dodo you want to fly. From there if your friend has their airport gates open, or by your friend giving you a dodo code to their island, telling Orville you have a code, and typing it in, your friend will be able to let you join them by asking the dodo I wanna visit someone via online play, unless they’re with you in person and its local.
