Godmode on build 42.14

[pearl elbow]

I've been trying for like an hour to turn on godemode so I can keep the server up for my friends while im AFK. I already did the -debug in properties, tried /setaccesslevel "name" admin (which doesnt work) tried pressing N which is my hotkey for giving myself godmode and in the game console it says it got turned on but I still die from zombies. Cant find anymore information on this