Heyo
@sleepyh!
Firstly, please note that our server only supports the premium version of Java Minecraft, and will not work with cracked accounts, windows, PE, Xbox, Switch, etc. If you have a bought java Minecraft account then great! I would first suggest trying to log out of your account by going to the launcher and going to the top where you'll see your in-game username. Click on that, and there should be an option to log out. Then log in
Hope I helped! Let me know if you're still having issues and we'll work through it together!
Best Regards,
Rani