How to join: https://store.steampowered.com/app/2000270/Dual_Universe/
Install the Game > PLay > Create account > Code:3433 to receive some goodies. Activate 2FA to get more goodies. Google: for the official discord if u have questions.
Its a mix between Minecraft + Eve Online + Satisfactory + Space Engineers + Kerbal + other games.
Content retrieved from: https://www.reddit.com/r/MMORPG/comments/xirvbg/upcoming_sandbox_scifi_mmo_dual_universes_demo_is/.