Client App SDK screen pop failing with 403 Forbidden

403 Forbidden when trying to initialize the screen pop. The error happens during the handshake between the custom app and the Genesys Cloud frame.

client_app_sdk is throwing this in the console during the initialize() call. It’s only happening for a specific group of agents who have the custom integration assigned. Other users are fine. The GET /api/v2/integrations/clientapps call returns the correct integration ID for these users, so the assignment is there.

The browser console shows:

Uncaught (in promise) Error: Forbidden - The client application does not have permission to access this resource.
at GenesysCloudClientApp.initialize (client_app_sdk.js:142:22)
at async CustomApp.start (app.js:12:5)

We’ve checked the OAuth client settings via GET /api/v2/oauth/clients/{clientId} and everything looks standard. The agents can’t get the screen pop to trigger even when the interaction is active and they’re in the correct state. It’s blocking the whole workflow for the Pacific team.

The 403 Forbidden error during the initialize() call typically indicates a mismatch between the user’s assigned roles and the Client App configuration. In CIC we used to handle this via simpler permission sets in the Attendant, but the GC SDK is far more restrictive regarding the integration’s visibility.

Since it’s only affecting a specific group of agents, it’s likely that the integration isn’t properly associated with the roles those users hold. You should verify if the users can even see the app via the API first. Try running a request against:

GET /api/v2/integrations/clientapps

If the app doesn’t appear in the response for those specific users, the SDK will throw that 403 because the handshake fails.

As a workaround, we’ve found that explicitly assigning the integration to a broader role often resolves the handshake failure when the custom app’s internal logic is too narrow. If the API call above returns an empty list for the affected agents, the issue isn’t in the code but in the Integration configuration. It’s a bit of a clunky process compared to how we managed ICWS permissions in CIC.

The 403 Forbidden error usually points toward a permissions gap, but since it’s only hitting a specific group of agents, the issue might be tied to how the integration is mapped to those users. It’s common to see this when the role assigned to the agent doesn’t have the specific permission needed to interact with the client app, or if the app hasn’t been properly authorized for that user’s profile.

You’ll want to look at the roles assigned to those affected agents. If the roles look identical to the users who aren’t having issues, check if there’s a mismatch in the integration settings themselves. A good way to verify what the system sees is to check the permitted apps for the logged in user. You can verify this by checking the output of the GET /api/v2/integrations/clientapps call for one of the failing agents. If the app doesn’t show up in that list, the agent doesn’t have the right to initialize it.

Are these agents all in the same Management Unit or assigned to a specific site? Sometimes site-level restrictions can interfere with how integrations behave. It would be helpful to know if they’ve had any recent role changes. Also, checking the console logs for any other clues besides the 403 would be a good next step.

GET /api/v2/integrations/clientapps

The 403 is a failure of the authorization layer to validate the subject’s claims against the resource’s Access Control List (ACL). This is a violation of the Principle of Least Privilege if the role is too broad, but here it’s a total lack of required scope for the specific integration ID.

Verify the role mapping via the API reference: Client Apps API.

Root cause: The 403 on /api/v2/integrations/clientapps for specific users usually isn’t a missing role, but a mismatch in the Client App’s allowed domains or the user’s assigned integration group. If the SDK’s initialize() call fails, it’s because the platform’s authorization layer rejects the request before it reaches the app logic.

Check if those agents are in a specific division that lacks the integrations:clientapps:view permission. A common workaround is to temporarily assign the Admin role to one affected user to see if the 403 clears. If it does, you’ve got a permission gap.

Also, verify the domain whitelist. If the custom app is hosted on a subdomain that isn’t explicitly listed in the integration config, the handshake fails.

Are the affected users using a different browser or a specific VDI image? That’d explain the grouping.

To debug the exact response via the Python SDK, you can intercept the request. The genesyscloud/api/integrations_api.py handles these calls. Try this to see the raw error:

import genesyscloud

api = genesyscloud.IntegrationsApi()
try:
 # Test the endpoint directly for an affected user's token
 apps = api.get_integrations_clientapps()
 print(apps)
except genesyscloud.ApiException as e:
 print(f"Status: {e.status}")
 print(f"Body: {e.body}")

If the body contains Insufficient Permissions, it’s a role issue. If it’s a CORS/Domain error, it’s the integration config.