@DDE12 try this
edit js/electron.js
and change this , approx line 70 in the develop branch
let address = (config.address === void 0) | (config.address === "") ? (config.address = "localhost") : config.address;
to this
let address = (config.address === void 0) | (config.address === "") | (config.address === "0.0.0.0") ? (config.address = "localhost") : config.address;
previous issue, reopened
https://github.com/MichMich/MagicMirror/issues/2550