Trying to communicate to with a password protected Ble Device

Ahh, I did just spot something...

scanMenu[device.name]= ()=>{
  console.log(device); // is displayed the device
  NRF.connect(device.id)
      .then((g)=>{
        console.log("NRF connection ok!");//is displayed
        var gatt = g;
        console.log(gatt);
        var device = g.device;
        //Second attempt of sending password
        device.on('passkeyRequest', function() {

By the time you add the passkeyRequest listener it's already connected - that could be it.

Maybe try:

scanMenu[device.name]= ()=>{
  console.log(device); // is displayed the device
  device.on('passkeyRequest', function() {
      console.log("passKeyRequested");
      device.sendPasskey("012034");
    });
  device.gatt.connect().then((g)=>{
        console.log("NRF connection ok!");//is displayed
        var gatt = g;
        console.log(gatt);
        return new Promise(resolve => setTimeout(resolve, 1000)); // wait 1 sec - just in case
 }).then(()=>{
        return gatt.startBonding()
 }).then(()=>{

You also had some slightly odd nested promise stuff that could have been a bit confusing too, so I unrolled that above as well.