Allow unauthenticated players, such as custom bots, to join the game without authenticating through Microsoft. Use the /allowplayer <player> command to allow a player with that username to join in the next 60 seconds, even if they aren't logged in to a valid Microsoft account. This allows players you want on your server to join but prevents random griefers/etc. from joining.

Note: Should work with new-ish versions as it doesn't change much code but I've only tested it on 1.20.1, 1.20.4, and 1.21.4

FAQ:

• Q: Will this support forge?
  • A: It doesn't right now and I have no plans to add support at the moment.
• Q: Can you backport it to older versions than 1.20?
  • A: Probably not, but you could try just using a fabric_loader_dependency.json file to override it (be warned that this probably won't work)
• Q: Are these questions actually asked frequently?
  • A: I don't know, but they seem like good things to answer
• Q: Are you just trying to fill up space on the mod page now?
  • A: Yeah because it looks better this way

Requires Fabric API