When you leave the tutorial state (aka when you log back in at the boat), if you're ever in the zone Exile's Reach without party sync you are instantly kicked out. Hearthing back to the boat would put you in Exile's Reach, leaving the tip of the boat put you in Exile's Reach.
Once the level 1 has left the tutorial state, the next step is for you to summon them out on another character. RAF summon or Warlock summon or Summoning stone, you just gotta summon them out of Exile's Reach and get them to turn off their exp. When their exp is off, then you enable party sync allowing you to use your hearth and progress through Exile's Reach to the hunter quest.