Passport not redirecting after authentication

I'm having some trouble with using Passport for authentication. I've defined my signup strategy as follows:

    passport.use('local_signup', new localStrategy({
  usernameField: 'username',
  passwordField:'password',
  passReqToCallback: true
},function(req,username, password,done){
User.findOne({username: username},function(err,user){
  if(err){
    console.log(err);
  } else{
    if(user){
      console.log("user exists.") 
    }
    else{
      const newUser = new User();
      newUser.email = req.body.email;
      newUser.password =req.body.password;
      newUser.username = req.body.user_name;
      newUser.first_name = req.body.first_name;
      newUser.last_name = req.body.last_name;
      newUser.save(function(err){
        if(err){
          console.log(err);
        }else{
          console.log('success');
        }
      })
    }
  }

})
})
)

I've then called this strategy in my register route

app.post('/register', passport.authenticate('local_signup', {
        successRedirect : '/drinks',
        failureRedirect : '/register',
        failureFlash : true
    }));

If the authentication was successful it should trigger the drinks route

  app.get('/drinks',function(req,res){
    if(req.isAuthenticated()){
      res.render('start');
    } else {
      res.redirect('/login')
  }

}) 

successRedirect isn't redirecting to the desired page. It remains stuck on the register route. The populated users however are showing up on my database so at least my strategy is working. I don't know how to debug this. Any help would be appreciated. Thanks

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