Enable or Disable Crossplay
Here you'll find the crossplay toggle. Make sure it's set to enabled to Skull and Bones Items join up with players from other platforms.

How to Play With Friends on the Same Platform
Playing with friends on the same platform is straightforward. Follow these steps:

Access the Social Menu
From either the Pause Menu or Inventory Menu, press the appropriate button:

Triangle (PS) / Y (Xbox)
Choose the 'Group and Friends' Tab
In the social menu, go to the Group and Friends tab. This shows your current party and a list of friends on your platform.

Invite Friends
Select a friend from your list and invite them to Skull and bones items for sale cheap your group. If they accept, you'll be able to sail together.