I was talking with someone and they mentioned how Atrium is not here. Explanation, please?

That's because it has never been available as a legend or master lost sector.

Atrium

C0bra5

uhik

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Thrilladrome

Levie

zailent

pilotguy25

SheckelBoi

breakthewall

Perdition

Concealed Void

Bunker E15

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Master

Season of the Lost

Season of the Hunt

Season of the Splicer

Season of the Chosen

Exodus Garden 2A

Veles Labyrinth

K1 Logistics

K1 Communion

K1 Crew Quarters

The Quarry

Scavenger's Den

Excavation Site

Bay of Drowned Wishes

Chamber of Starlight

K1 Revelation

Empty Tank

Season of the Risen

Sepulcher

Metamorphosis

Extraction

Season of the Haunted

The Conflux

Skydock IV

Season of the Plunder

The Rift

Season of the Seraph

Hydroponics Delta

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Season of Defiance

Season of the Deep

Season of the Witch

Season of the Wish

Echoes

Revenant

Heresy

Europa

Difficulty

Season

Cosmodrome

Moon

Dreaming City

(DCV) Tangled Shore

Savathûn's Throne World

Nessus

Neptune

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