Why does Passport-jwt return unauthorized error

Question

I'm trying to make a very simple authentication scenario with passport-jwt. When I access a protected path, it keeps returning 'unauthorized'. I've tried almost everything suggested on similar threads but it doesn't work. All I want to do for now is have a call to 'authenticate' path in order the JWT token to be generated and then call the 'protected' path and allow access. For simplicity, I have all the code in server.js.

Here is the code:

const express = require("express");
const  passport  =  require('passport');
const jwt = require('jsonwebtoken');
const  JWTStrategy  =  require('passport-jwt').Strategy;
const ExtractJwt = require('passport-jwt').ExtractJwt;
const secret = "s0m3$3Cret$h0lyC0d3&$";

const options = {
    jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken,
    secretOrKey: secret,
    algorithms: ['RS256']
  };

passport.use(new JWTStrategy(options, function(jwt_payload, done){
        return done(null, {id: 'FAKE_ID'});
    }
));

const app = new express();

app.get('/authenticate', (req, res, next) => {
    const token = jwt.sign({sub:'FAKE_ID'},secret,{expiresIn: 604800});
    res.status(200).json({ success: true, message: 'Logged in successfully!', token: 'Bearer ' + token});
})

app.get('/protected', passport.authenticate('jwt', { session: false }), (req, res, next) => {
    res.status(200).json({ success: true, msg: "You are successfully authenticated to this route!"});
});

app.listen(3000, () => {
    console.log('App running at 3000')
})

Thank you in advance