Techland Accounts are no longer required for Dying Light: Bad Blood!

They granted beta keys for Playtest sessions, which lasted 25-26 August and 1-4 September.

The game is in the so-called Early Access phase and you need to purchase a Founder's Pack in order to play the game in this phase.

After the Early Access phase is over, the game is going to follow a free-to-play model.

See also: Steam activation key from the website doesn't work