i would like to sign up a team consisting of me Sulfur1 and Flying_Olsen

Okay wow i finally fixed it. The issue with starting the Forged Alliance through steam was a missing ResampleDmo.dll
I tried fixing that by installing the Media Feature Pack for Windows 11 (i had a Windows 11 N version that is missing the media stuff), but the installation failed.
Then i just got a mate to send me the missing ResampleDmo.dll files from
C:\Windows\SysWOW64\RESAMPLEDMO.DLL
C:\Windows\System32\RESAMPLEDMO.DLL
and placed them in both directories (they are different files).

This also fixed the error i got when starting the FAFClient

Hope this helps someone else. I will also upload the dll files here. Use at your own risk, but better yet get them from someone you trust.
ResampleDmo.zip

I am withdrawing from the tournament.
I signed up together with Flying_Olsen, pls keep him in the tournament.
thx for organizing

Better solution is to keep trying to install the Media Feature Pack for Windows 11 (missing in Windows 11 N version and the cause for the error):
From reddit: https://www.reddit.com/r/Intune/comments/18bm21f/windows_11_enterprise_n_missing_media_feature_pack/

The 2nd command might fail simply retry and it should succeed and a reboot is required to complete this.

Open an Elevated Command Prompt and run the following command:

dism /online /add-capability /capabilityname:Media.WindowsMediaPlayer~~~~0.0.12.0

And then run (the following command is only for N and KN Editions:)

dism /online /add-capability /capabilityname:Media.MediaFeaturePack~~~~0.0.1.0