Hello @orzabal_de thank you for getting in touch with us and sorry to see you have had some trouble running the game with DirectX12 and DirectX11.
To help resolve this, would you be able to try the following fixes that have worked for this error message in the past? >>
Fix 1 >
Locate this folder C:\Anno 1800\Support\DirectX\DXSETUP click on the .exe app and run the DXDiag setup, then install DirectX 11 or 12 when prompted. Test the game on each DirectX version 11 and 12.
Fix 2 >
Occasionally your Windows OS will not update its DirectX versions automatically and you will have to force an update yourself
Step 1: Press the Windows Key and type DXDIAG, then click on the ...