EU4 has been marked as unsupported by Steam Deck : r/eu4

Steam Deck™

Valve's Steam Deck 512 GB (EU Plug) V004288-10 / V004288-20 / V004288-30

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Steam Deck can now be purchased without a reservation

Steam Deck, Switch players warned as heat waves cook Japan, Europe - Polygon

Steam Deck performance will suffer in 95+ degree temps, Valve warns - Niche Gamer

Wario64 on X: Valve expands Steam Deck sales to Japan, South Korea, Hong Kong, and Taiwan reservation queue for the new regions will not impact delivery estimates for the current reservation

Valve upgrades the Steam Deck with OLED screen

The best Steam Deck accessories in 2023

Valve Steam Dec, USB, 256gb : Video Games