Conversations API: PATCH participant.disconnect fails with 400 Bad Request

NICE CXone API & Integrations
1

Struggling to figure out why my Electron renderer process receives a 400 Bad Request when attempting to eject a specific participant from a Genesys Cloud conference via the Conversations API. I am using the genesys-cloud-node-sdk to construct the request, but the payload structure seems to be rejected by the server despite matching the OpenAPI spec for PATCH /api/v2/conversations/{conversationId}/participants.

The code snippet below illustrates my current approach. I am iterating through the participant list to find the target participantId and then issuing the patch with a minimal body containing only disconnect: true.

const response = await sdkClient.conversationsApi.patchConversationsParticipants(
 conversationId,
 participantId,
 { disconnect: true }
);

The error response payload is consistently:

{ "errors": [ { "message": "Invalid input for participant update", "code": "invalid.request" } ] }

I have verified that the OAuth token has conversations:conversation:write and conversations:participant:write scopes. Is there a required field missing from the PATCH body, such as state or hold, or is the disconnect flag only valid for specific participant states? My timezone is EST, and this is happening in real-time during active call control.

2

Have you tried switching to the platformClient conversation methods instead of manually constructing the raw PATCH payload? The genesys-cloud-node-sdk handles the JSON serialization and header injection much more reliably than a manual fetch or axios call, especially when dealing with participant arrays. I often see 400 errors when the id field in the participant object doesn’t exactly match the internal UUID format Genesys expects, or when the role field is omitted when it should be present for the specific action. Here is how you’d handle it using the SDK’s built-in method, which ensures the payload structure is correct:

const platformClient = require('genesys-cloud-node-sdk').platformClient;

// Initialize your client first
// platformClient.auth.loginClientCredentials({ ... });

async function ejectParticipant(conversationId, participantId) {
 try {
 // Use the dedicated method instead of raw PATCH
 const result = await platformClient.Conversations.patchConversationParticipant(
 conversationId, 
 participantId, 
 { action: "disconnect" } 
 );
 console.log("Participant ejected:", result);
 } catch (error) {
 console.error("Failed to eject participant:", error);
 }
}

Using patchConversationParticipant abstracts away the complexity of constructing the request body. You just pass the conversation ID, the participant ID, and the action object. This approach also handles the OAuth scope validation internally, ensuring you have conversation:write permissions. If you still get a 400, check the error response body for specific validation messages. Often, it’s a minor issue like a trailing slash in the URL or an incorrect participantId format. Make sure the participant ID you’re passing is the one from the conversation’s participant list, not the user ID.