Running into a weird auth loop with the Genesys Cloud Platform SDK (Python v3.21). The initial access token works fine for GET /api/v2/organizations, but as soon as it expires and the SDK attempts to refresh, every subsequent call gets a 401. The refresh endpoint /api/v2/oauth/token returns a 200 with a fresh token, but the client keeps sending the old one or fails immediately after.
Here’s the setup:
client = PureCloudPlatformClientV2.Environment(environment='mypurecloud.com')
client.login(client_id=os.getenv('CLIENT_ID'), client_secret=os.getenv('CLIENT_SECRET'))
I’ve added a custom token provider to log the state:
class DebugTokenProvider:
def get_access_token(self):
token = self.client.token_provider.get_access_token()
print(f"Token expiry: {token.expires_at}")
return token.access_token
client.token_provider = DebugTokenProvider()
The logs show the refresh happens correctly. The new token has an expires_at timestamp 350 seconds in the future. Yet, the very next API call fails with:
purecloudplatformclientv2.rest.ApiException: (401) Reason: Unauthorized
The response header WWW-Authenticate says Bearer error="invalid_token".
I’ve checked the server time on the EC2 instance (Sydney time) and it’s synced via NTP. The drift is less than 50ms. Genesys docs mention a 5-minute clock skew tolerance, but this seems tighter. I even tried manually setting the Authorization header with the new token from the refresh response, and it still 401s. If I wait 30 seconds and retry, it works. It’s like the token is valid but the server’s validation window hasn’t caught up to the issued-at time.
Is there a known issue with token validation lag after refresh? Or is the SDK caching the old token header despite the provider update? I’ve restarted the container to rule out memory leaks, same result. Feels like a race condition between the refresh response and the server’s token store.
Are you using the PlatformClient directly or wrapping it in a custom HttpClient handler? I’ve seen this exact 401 loop in our .NET services when the token refresh happens on a different thread than the one holding the PlatformClient instance. The SDK’s internal token cache isn’t always thread-safe if you’re sharing the client across async contexts in Azure Functions.
The docs for the .NET SDK explicitly state:
“PlatformClient implements IDisposable and should be instantiated per request or managed carefully in long-running processes.”
If you’re reusing a singleton PlatformClient in a background service, the refresh callback might be racing with the outgoing request. The new token gets issued, but the outbound HttpClient hand has already grabbed the old one.
Try instantiating a fresh PlatformClient for each logical unit of work, or switch to using the OAuthClient directly to manage tokens and inject them into a raw HttpClient. Here’s how we handle it in C# to avoid the stale token issue:
var oauthClient = new OAuthClient(clientId, clientSecret, oauthUrl);
var tokenResponse = await oauthClient.AuthorizeApplicationAsync();
using var httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Authorization =
new AuthenticationHeaderValue("Bearer", tokenResponse.AccessToken);
// Use httpClient for all API calls.
// Handle 401 manually by re-calling AuthorizeApplicationAsync.
The Python SDK might be doing the same thing under the hood. If the refresh token rotation is happening, check if your code is catching the 401 and retrying with the new token object, or if it’s just retrying with the old reference. Also, verify the expires_in value in the refresh response. Sometimes the server sends a short-lived token if the client IP changes, which triggers another immediate refresh.
Check the SDK logs for the actual Authorization header being sent. If it’s still the old token string, the refresh callback didn’t update the internal store correctly.