Cross Server Play?

So me and some friends are playing on different servers around the lvl 20 and were trying to figure out how to invite to party cross server but its not working. Anyone know whats going on?

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Open world in particular is not available to cross server, sorry to inform you.

For cross-server its : Raids, Dungeons, Cube, Plat Fields, Auction house, Character name, Boss Rush, PVP arenas

Server specific(or server locked) is : Guilds, Friends (list), Islands, Open world, Strongholds (cross in KR, maybe be wrong here), GvG, Life skills (professions)