I have to agree with this, kudos to you.
If you got an error related to the server just wait several minutes, you're not the only one playing this for free key, such error is perfectly understandable given the number of players playing this.
At least we don't have NODATAFOUND error anymore...
Because it's currently paused, maybe to solve all of this NODATAFOUND issues.
If you're going straight to Feudalife Challenges! (indiegala.com) page when the Gameplay Giveaway is paused, it'll give the error notice that you mentioned, you won't get any error when it's available.