This issue is now resolved, thank you for your patience.

We are begining to see authentication errors return to normal levels.

After investigation, this issue seems to be related to logging into or refreshing accounts. Any users who are already signed into their launcher will not experience any issues playing on multiplayer servers, hosted worlds or Badlion Client

We are aware of issues with Minecraft's Session Servers causing errors when attempting login, attempting to launch Badlion or when attempting to play Multiplayer including Hosted Worlds.

We will update this message when the issue has been fixed.