I play this game mostly with my boyfriend and we were doing the Main Scenario Quest and other side quests in The Fringes and The Peaks before. When we would teleport to the aetheryte in that area we would be put in two different instances of the area. This made doing quests a lot harder.

I would suggest two options:

Put party members automatically in the same instance: this way the problem would be solved automatically. You could for example put them automatically in the lowest populated instance.


Let people join another party member's instance by right-clicking on the name in the party frame and have an option "Join instance" for example. This could be annoying for bigger parties though.

I personally would suggest the first option.
If you have any criticism or other suggestions, please let me know below.

Have a nice day!