DRF and Oauth2: creating resource and authorization servers

I have developed a blog like project on the django rest framework and oauth2. I am now trying to separate the resource and authentication servers as shown here: https://django-oauth-toolkit.readthedocs.io/en/latest/resource_server.html

I have taken the following steps:

1. set up the auth server as described in the docs
2. added the below to settings.py in the auth server

OAUTH2_PROVIDER = {
    'SCOPES': {'users': 'user details', 'read': 'Read scope', 'write': 'Write scope', 'groups': 'Access to your groups', 'introspection': 'introspection'},
    'ACCESS_TOKEN_EXPIRE_SECONDS': 86400,  # 1 Day.
}

3. set up the resource server as described in the docs
4. added this to settings.py in the resource server:

OAUTH2_PROVIDER = {
'RESOURCE_SERVER_INTROSPECTION_URL': 'http://localhost/o/introspect/',
'RESOURCE_SERVER_AUTH_TOKEN': 'abc',
}

I created the RESOURCE_SERVER_AUTH_TOKEN based on instructions here: Django OAuth- Separate Resource and Authorization Server

To summarise, I created a superuser for the resource server then added an application to the resource server using the admin site, choosing confidential for client type and authorization code for authorization grant type. 'abc' was the random string I chose for the access token.

Nevertheless, I am still facing the following error:

Introspection: Failed to get a valid response from the authentication server. Status code: 403, Reason: Forbidden.
NoneType: None

Do you have any idea of where I may be going wrong from what I've described? Have I understood this correctly and created the RESOURCE_SERVER_AUTH_TOKEN in the correct manner?

I had the same problem when using the 'RESOURCE_SERVER_AUTH_TOKEN'. So instead I used the client_id and client_secret.

Go ahead and try the following:

OAUTH2_PROVIDER = {
    'RESOURCE_SERVER_INTROSPECTION_URL': 'http://127.0.0.1:8000/o/introspect/',
    'RESOURCE_SERVER_INTROSPECTION_CREDENTIALS':
        (
            client_id,
            client_secret
        ),
}

That is how it worked for me.