I guess the public link to this page is busted at /play. I found another way to navigate after logging in which directed me to the correct page.
A work of art is never finished, merely abandoned
The link is https://www.faforever.com/account/link
From which button or process did you get that linkSteam? That URL needs to be fixed. The play button is fine for me.
@magge @Nvrnight this issue has already been fixed. It probably was the button on the "Play Now" page
FAF Website Developer