How to get the AoE2 Dawn of the Dukes DLC key (currently included in the pre-order)?
Title says it all.
<NOTICE
Pre-order your Age of Empires IV Steam key now at Gamesplanet and get the Age of Empires II: Definitive Edition “Dawn of the Dukes” expansion as a free bonus in August 2021*.
*Expansion bonus requires Age of Empires II: Definitive Edition game, sold separately.>