When i try to login to my local server to test some stuff luckperms doesnt let me join,

Gonna take a wild guess that you're using CraftBukkit + offline mode.

https://github.com/lucko/LuckPerms/wiki/Installation#craftbukkit-and-offline-mode

Please make sure you are using Spigot or Paper, or enable online-mode.

Failing that, I need to see your server logs.