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!

@brutus5000 Me neither.
But now I'm happy and enjoying the FOF.

You guys made very great work with SC!

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!

@brutus5000

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

@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.

@eszusz I can't buy it because I already have...

There is my privacy settings:

I can confirm I literally own the SC and SC:FA on Steam and I trying to use my only one STEAM account so this cannot be the problem.
The Link button now just refresh this page and write the red error message that I mentioned in the previous post. It seems the website has the problem.

Any other soulution?

Hi all,

Any solution for this?
I got the same problem. Tried everything. Different browsers, private browsers also. Reboot, cache clear. Different PC. Keep gething "Error! Your steam account was not successfully linked! Please verify you logged into the website correctly.". My profile is also set as public on all the way.

I have Supreme Commander and Supreme Commander: Forged Alliance on steam.

Thanks in advance! Cheers