In this section of the docs, configuring the Dashboard host/port/etc. is listed as:
module.exports = {
port: 24012,
host: "localhost",
verbose: false,
};
When it should be (IIRC, please verify):
module.exports = {
// ... rest of truffle-config.js ...
dashboard: {
port: 24012,
host: "localhost",
verbose: false
}
};