The multiplayer mode in Monster Hunter: The Wild is a very important mode in the game. If you want to enable this mode, you can first play the game, create characters and play for a while until you find yourself in a base camp with many NPCs, which takes about an hour.
How to unlock Monster Hunter Wild Multiplayer Mode
In order to play multiplayer, you must first create your Hunter and Palico, watch some cutscenes, and then play the story until you find yourself in a base camp with a lot of NPCs. It all takes about an hour. At some point, the game will require you to visit your tent in the camp for the first time. When you leave the tent, you will find you in the same hall with other players.
This is the key point of unlocking in multiplayer mode. Now let's have everyone join a private hall, add each other as hunter friends, and start a mission.