Mission: use 3 legendary items in research station

[Valiance]

I only get another Legendary item, I was expecting to finish the mission, but it does not finish. I am using legendary items, not artifacts. What am I doing incorrectly?

[Defektiv]

Needs to be legendary subsystems, not turrets. I made the same mistake the first time. Only one can be an artifact as well.

[KaneNOD]

It will only works with modules, and that are not Xsotans ones. Only normal legendary modules will work.

[Valiance]

Thank you, both