None of you successfully linked the accounts you use in this forum to Steam (I looked it up in the database).
If you think you did this successfully, it was probably on a different account name. In that case try to do a password reset via Steam to reveal which account that was.
FAF doesnt recognize I have supcom
"Nerds have a really complicated relationship with change: Change is awesome when WE'RE the ones doing it. As soon as change is coming from outside of us it becomes untrustworthy and it threatens what we think of is the familiar."
ā Benno Rice
@brutus5000 Thank you for the answer!
I tried to reset password via steam, unfortunately I got the following error messages:
{"requestId":"e7d332ae-cdbb-4e20-b38a-848c3cce7808","errors":[{"status":"422","title":"Unable to resolve steam id","detail":"The Steam ID '76561198049802665' does not match any account.","code":"193","meta":{"args":["76561198049802665"]}}]}
I think I couldn't connect my steam account then.
Now I tried to link my steam account again. After I press the "yellow" colored "Link your FAF account to Steam", the page suddenly refres it self and I get the red error message, without any redirection to steam sign in.
What can prevent me from linking? I followed the guidelines, also tried some "solution" from the forum. I'm absolutely lost.
Last idea is logout and relogin on the website.
I'll try testing with my account later on to see if the process maybe is broken.
"Nerds have a really complicated relationship with change: Change is awesome when WE'RE the ones doing it. As soon as change is coming from outside of us it becomes untrustworthy and it threatens what we think of is the familiar."
ā Benno Rice
I tried it before. I gave it another chance, though.
Now I got this:
I would appreciate if you'll test it.
Thank you.
PS: I tried it from another PC, still error 
Finally.
I have successfully linked my account!
I tried to figure out what can be the problem and noticed that the SC:FA was marked as private, therefore FAF cannot recognize I have SC:FA regardless my privacy settings.
To help someone in the future:
Navigate here in the steam via browser:
Then search for Supreme Commander and Supreme Commander: Forged Alliance and click to this icon(picture) or click on the three dot and select "unmark as private"
To be honest I don't have any idea why it was marked as private because I haven't marked it before.
GL & HF everybody!
I wasn't even aware this was possible for single games.
"Nerds have a really complicated relationship with change: Change is awesome when WE'RE the ones doing it. As soon as change is coming from outside of us it becomes untrustworthy and it threatens what we think of is the familiar."
ā Benno Rice
It's a recent change from Steam, but AFAIK, it's opt-in, so I'm surprised that SCFA was set like that automatically.
Maybe even in the onboarding process itself ā I raised an issue: https://github.com/FAForever/website/issues/538
@brutus5000 Me neither.
But now I'm happy and enjoying the FOF.
You guys made very great work with SC! 