not authorised to access this resource

[Opperessor]

from google.auth import credentials
from google.auth.transport.requests import Request
from google.oauth2 import service_account

SCOPES = ['https://www.googleapis.com/auth/admin.directory.group.readonly',
          'https://www.googleapis.com/auth/admin.directory.group.member.readonly',
          'https://www.googleapis.com/auth/admin.directory.group.member',
          'https://www.googleapis.com/auth/admin.directory.group']

# Path to your service account JSON key file
SERVICE_ACCOUNT_FILE = 'key.json'

# Create credentials object
credentials = service_account.Credentials.from_service_account_file(
    SERVICE_ACCOUNT_FILE, scopes=SCOPES)

# Refresh the credentials to obtain an access token
credentials.refresh(Request())

# Get the access token
access_token = credentials.token

print(access_token)

import requests

url = "https://admin.googleapis.com/admin/directory/v1/groups/demo@protecto.io/members"

access_token ="nfkaefiuagefhiu........skjgsgf"
headers = {"Authorization": f"Bearer {access_token}"}

response = requests.get(url, headers=headers)

# Print the response
print(response.json())

created an access token with the scopes used it to make get call. im getting this error
{'error': {'code': 403, 'message': 'Not Authorized to access this resource/api', 'errors': [{'message': 'Not Authorized to access this resource/api', 'domain': 'global', 'reason': 'forbidden'}]}}