Error message when attempting to link Steam account

When I go to https://www.faforever.com/account/link, and click on the Sign in through STEAM button (below):

I am redirected to https://www.faforever.com/account/connect, and I receive the error:

Error! Your steam account was not successfully linked! Please verify you logged into the website correctly.

This happened after I attempted to link my Steam account while forgetting that I had not set my game library to public. I am now unable to connect my account to a steam account.

This can be solved by clearing cookies for the site, re-logging in, and trying to connect the steam account. Simply reloading, or even logging out and back in is not sufficient to fix the problem.