How are people teaming up?
Limitless |
gw2lfg.com
You can join same instance with people from different servers, as long as its the same region (NA or Europe for example).
the aforementioned website is reliable. Getting into an active guild with a lot of people running dungeon is also recommended since you can count on your guildies to not kick you or refuse to party with you for a dungoen run, granted that you’re a decent level 80.