@kawaiinekololis play.pixelbox.fun | tested on 1.16.5

same it happen to me

What version? Post your game log.

Change protocol version using ViaFabricPlus.
Also next time, you should at least tell which server.

The "unable to MS Auth: 404 error" typically indicates that there's an issue with the authentication process, and the server cannot find the requested resource (404 error). Here are a few steps you can take to troubleshoot and resolve this issue:

Check URL and Configuration: Ensure that the URL you are trying to access for Microsoft authentication is correct and properly configured. Verify that the URL matches the one specified in your application's authentication settings. NCEdCloud

Verify Application Registration: Double-check that your application is properly registered with Microsoft Azure Active Directory (Azure AD) or the Microsoft identity platform. Make sure that the application ID (client ID) and secret (client secret) configured in your application match the ones registered in Azure AD.

How can i do it?

This indicates that you are not using a Premium account, and the server requires a Premium account.

bump....