The API key mismatch. Regenerate your API key in Agent17 and update the config.yaml . Restart both servers.
If the game fails to launch, install the following:
Yes, the base game is available for free download from the official HEXATAIL website. Optional “supporter packs” may exist for those who wish to support development, but they are not required to enjoy the full story.
Before you begin the Agent17 Hexatail install process, make sure you have the following ready.