Invalid_client or unsupported_grant_type in djnago testcases

This is my code which is a simple signup and login and I'm trying to login via oauth2

class UserAuthTests(TestCase):
    def setUp(self):
     self.client = APIClient()
     self.user = CustomUser.objects.create_user(
        username='test',
        password='strongpassword123',
        email='test@example.com'
     )

     self.application = Application.objects.create(
        name="Test Application",
        client_type=Application.CLIENT_CONFIDENTIAL,
        authorization_grant_type=Application.GRANT_PASSWORD,
        skip_authorization=True,
        user=self.user,  # Associate the application with the user
     )
     self.application.save()

def test_register_user(self):
    url = '/api/users/register/'
    data = {
        'username': 'newuser',
        'password': 'newpassword123',
        'email': 'newuser@example.com'
    }

    response = self.client.post(url, data, format='json')
    print(response.data)
    self.assertEqual(response.status_code, status.HTTP_201_CREATED)
    self.assertEqual(response.json()['username'], 'newuser')

def test_login_user(self):
    url = '/o/token/'
    data = {
        'grant_type': 'client_credentials', # i've tried with 'password' as well
        'username': 'test',
        'password': 'strongpassword123',
        'client_id': self.application.client_id,
        'client_secret': self.application.client_secret,
    }
    print(self.application.authorization_grant_type == 'password')
    print(f"Request Data: {data}")

    response = self.client.post(url, data=data, content_type="application/x-www-form-urlencoded")

    print(f"Response JSON: {response.json()}")

    self.assertEqual(response.status_code, status.HTTP_200_OK)
    self.assertIn('access_token', response.json())
    self.assertIn('refresh_token', response.json())

I'm getting Response JSON: {'error': 'unsupported_grant_type'} or Invalid Client, my settings file looks like this -

OAUTH2_PROVIDER = {
    'ACCESS_TOKEN_EXPIRE_SECONDS': 36000,  # Set token expiration
    'OAUTH2_BACKEND_CLASS': 'oauth2_provider.oauth2_backends.OAuthLibCore',
}

I have tried changing content_type, but it has not worked. Please let me know how I can fix this.

In my postman, I've tried the same and it works, here is the curl -

curl --location 'localhost:8000/o/token/' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode 'grant_type=password' \
--data-urlencode 'username=test' \
--data-urlencode 'password=strongpassword123' \
--data-urlencode 'client_id=Q0hvMw2Mk7uv5U4q8LMIOiK9Jo7SpJeXuFbXzaUW' \
--data-urlencode 'client_secret=nUgC6P1OAs6g2qGhS8yPzhh5uenHDVGQBHxM1uGcng3vym5v8vxcEqU6glnfR7XMOURt41k5zDx3pSK0r8HTH5l1VLIaDPMBiY6pjijhoVPjR1N7sLgk1TZxN0zZShaJ'

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