80623: Duplicate Participant Request

This error occurs when Proxy receives a request to create a Participant for an Identifier while another request for that same Identifier is still in progress in a different Session. Proxy rejects the request with a 409 conflict to prevent multiple active Participants from sharing the same Identifier and ProxyIdentifier pair, which can cause calls or messages to be routed incorrectly.

• Your application sent multiple Participant create requests for the same Identifier at nearly the same time.
• A Session create request that included participant parameters ran while another Participant create request for the same Identifier was still being processed.
• Your application retried a Participant create request before the earlier request completed.
• The same participant is being added to multiple concurrent Sessions without coordinating request order.

• Create Participants for the same Identifier one request at a time instead of sending parallel requests.
• Include FailOnParticipantConflict=true in Participant create requests, or in Session create requests that include participant parameters, so Proxy can reject conflicting requests immediately.
• When you receive 80623, wait for the earlier conflicting request to complete and then retry the failed request.
• If the same participant must be active in multiple concurrent Sessions, add enough Twilio phone numbers to your Service so that participant can be assigned a unique Proxy number in each active Session.

• Participant resource
• Session resource
• How many Phone Numbers do I need?