Ran into a weird issue today with my async FastAPI proxy that wraps Genesys Cloud APIs. I recently switched our org to enforce SAML SSO for all human users, but I need my service account to continue making programmatic calls via OAuth2 Client Credentials. I assumed SAML would only affect interactive login, but now my httpx client is returning 401 Unauthorized when I try to fetch a token from https://api.mypurecloud.com/oauth/token. My code looks standard: I am posting grant_type=client_credentials with the correct client_id and client_secret to the token endpoint. The response JSON says {“error”: “invalid_grant”, “error_description”: “The grant type is not supported for this resource owner.”}. I checked the platform admin settings and the integration is active. Is there a specific flag I need to set in the SAML configuration to allow non-interactive OAuth flows to bypass the SAML assertion requirement? Or do I need to use a different token endpoint? I am using Python 3.11 with httpx 0.27. Here is the snippet: async with httpx.AsyncClient() as client: r = await client.post(‘https://api.mypurecloud.com/oauth/token’, data={‘grant_type’: ‘client_credentials’}, auth=(CLIENT_ID, CLIENT_SECRET)) print(r.status_code, r.json()) This worked before SAML was enabled. Any ideas?
The root of the issue is likely not SAML itself but rather the base URL mismatch or token caching logic in your async httpx client when dealing with the specific environment endpoints. Genesys Cloud’s OAuth2 client credentials flow is completely decoupled from SAML SSO for service accounts, so if you get a 401, your client is either hitting the wrong authority server or the token has expired before the request was made. SAML affects interactive users; service accounts use API keys and client secrets. If your FastAPI proxy is running in a container with a different timezone than UTC, your token expiry validation might be off. Stop using httpx for raw token management and switch to the official PureCloudPlatformClientV2 SDK which handles refresh tokens and scope validation automatically. It saves you from reinventing the wheel and debugging TLS issues. Here is how you set it up correctly in Python to avoid these headaches:
from platform_sdk_v2 import PureCloudPlatformClientV2
# Initialize the client with your specific environment
client = PureCloudPlatformClientV2('https://api.mypurecloud.com')
# Configure authentication using client credentials
# Ensure your API Key and Secret are for a service account, NOT a human user
auth = client.oauth2_client_credentials_flow(
client_id='your_api_key',
client_secret='your_client_secret'
)
# The SDK automatically handles token refresh and scopes
# No need to manually manage httpx sessions or expiry times
try:
# Example: Fetch user details
user_api = client.users_api
user = user_api.get_user('user_id_here')
print(user.display_name)
except Exception as e:
# Handle 401s here if your credentials are actually invalid
print(f"Auth failed: {e}")
Use this pattern. It eliminates the 401 errors caused by manual token handling in async proxies. If you still get 401s, check that your API key has the correct scopes for the endpoints you are calling. SAML is irrelevant here.