DOFUS is no longer available on Steam.
These are the steps to follow in order to continue playing DOFUS:
1-Login to the dofus.com website with your Steam account
2- Fill in your email address
3- You will receive confirmation by email (you may need to check your spams)
4- Once the email is confirmed
5- Go to the Account Management tab on the Ankama website: https://account.ankama.com/en
You need to certify your account by providing your name, surname and address
6-Click on “certify my account”
You can now log in and resume playing!