By default, Minecraft servers verify accounts with Mojang/Microsoft. To allow cracked players to join, you must disable this check: online-mode=false server.properties file, toggle this to . This allows players without a paid account to join. Security (Mandatory) online-mode=false allows anyone to join with any username, you install an authentication plugin like AuthMeReloaded to prevent players from logging into each other's accounts. Skin Restoration
do not work on cracked accounts because they require a valid Minecraft API check to prevent multiple accounts or ban evasion. Security Risks : Running or joining a cracked server involves setting online-mode cracked speedrun server better