Django doesn't requests the data to login users - django

Question

<form action="login" method="post" >
{% csrf_token %}
<div class="form-group mb-3">
<label class="label" for="name">username</label>
<input type="text" id="username" class="form-control" required>
</div>
<div class="form-group mb-3">
<label class="label" for="password">password</label>
<input type="password" id="password" class="form-control" required>
</div>
<div class="form-group">
<input type="submit" action="login">
</div>
<div class="form-group d-md-flex">
<div class="w-50 text-left">
<label class="checkbox-wrap checkbox-primary mb-0">Remember Me
<input type="checkbox" checked>
<span class="checkmark"></span>
</label>
</div>
<div class="w-50 text-md-right">
Forgot Password
</div>
This is the form.
def login(request):
if request.method == "POST":
username = request.POST['username']
password = request.POST['password']
user = authenticate(request, username=username, password=password)
if user is not None:
login(request, user)
return redirect("dashboard")
else:
messages.info(request, "User doesn't exist. Contact the teacher!")
return redirect("index")
else:
return render(request, "login.html")
This is the views function.
from django.shortcuts import render, redirect
from django.contrib.auth.models import User, auth
from django.contrib import messages
from django.contrib.auth import authenticate, login
Those are the imports.
But this doesn't redirect user who has already registered, to the page specified. Not a problem of urls or the csrf_token. I think the problem is in the sending data part because the else function triggers and shows the massege user doesn't exist..... Please help.