I'm trying to make a quest where when a door is unlocked (one that teleports to a dungeon) my quest advances from Stage 10 to Stage 20 but even when I put the defaultactivateonopen it just leaves my quest marker on the door and doesnt advance the quest... any help would be nice on this as I'm a little new and just need to figure out why an defaultOnOpen set to when a door is opened and teleport doesn't advance the stage...

Do I need to set an OnLoad to something on the Interior/ so that when I finish teleporting into the dungeon it advances instead of the OnOpen?

You're doing it wrong, way wrong.

What you gotta do is create an alias for your door in your quest and create & attach a script to it that has an OnOpen event.

Put this in your door's ReferenceAlias script:

event OnOpen(ObjectReference akActionRef)if(GetOwningQuest().GetStage() == 10)  GetOwningQuest().SetStage(20)endifendevent

Put any other scripting stuff you need inside the stage you just set to.

Everything should work this way. Remember, aliases are your best friends.