i want to boost trial 4 how the people can get to me in the trial my mate cant port to me dont know why

-Reach last boss room
-Disconnect (it'll put you back in the areawhere you can enter, but outside)
-Invite your friend
-Go in, he can too
-Go kill the boss, he musn't enter the boss's room
-Gg

first u have to get out of the trail and save progress like tp to his hideout then go back to trail area with waypoint
he ports on you and u go in together

I have to join last bossroom first and than dc?