I am hosting a server and it has been working just fine but from yesterday, I don't know what has happened. In my 'server.properties' file 'Whitelist' and 'Online-mode' is turned on and I have whitelisted people but no one can join. Whenever someone tries to join it says "You need to authenticate to Microsoft Services" but I have tried this with multiple accounts and all of them are authenticated but no one can join. For now, as a bandage, I have disabled whitelist but that is not a permanent solution. To recreate this bug, just copy my server's properties in your 'server.properties' file. And again everything like Port Forwarding and Firewall is done correctly.