Doing instaces with a premade group

[Celekairi]

So me, my GF, my brother and a friend are playing this game at the same rate and we would like to enjoy instaces with a group consisting of the 4 of us. I play a marauder, my gf plays an arcanist, my bro plays a gladiator and my friend play another gladiator.

Currently whenever we try to access an instant via duty finder it says that we do not meet the requirements even though we are all in the same quest for the instance. So my take on it is that the game automatically assisngs you a role based on your class and in the setup we have the game sees 3 tanks and 1 dps. I try to enter the instance through the entrance but it just pops the duty finder.Is there a way to either choose the role you want to fill in the duty finder or at least let us enter without having to go through the duty finder?

To Yoohre_Wildriver: re-read bold part

[Yoohre_WildRiver]

To Yoohre_Wildriver: re-read bold part

thats weird.. i did all my dungeons with friends
set up was

ACN ACN GLA LNC no healer... all we did was go to the entrance click the shiny thing and go in no duty finder pops. the only thing that poped was waiting for party check 1/4 - 4/4 OK and boom we are in..