My account is linked with another account

Hello,
I'm disappointed because when i want link my steam account, i got this message.

Dark_Tigrou is my numeric surname so it's mine... but is there a steam account or a FaForever account ?

You should log in with the Dark_Tigrou account since you already linked it. If you forgot the password you can reset it with steam on the website.

Hello,
It's seems Dark_Tigrou steam account is not mine.
Steam support don't find any mail address nor CD keys...
So what can I do ?
This FA account is probably not the good account.
I had a problem last year or more and create another account.
Impossible for me to find which account.
No mail works on FA. Juste this one, my main.
Any help ?
How to log and play ?

You already are able to log in with a steam account as shown by the screenshot. Since you forgot the password to that account go onto the FAF website and reset your password via steam. That will reset the password for the FAF Dark_Tigrou account then you can login with Dark_Tigrou.

The error message tells you your FAF account name. Not your steam account name.