80409: Session Sid Invalid

You provided an invalid Proxy Session SID. Use a valid Session SID when you fetch, update, delete, or nest requests under a Proxy Session. A Proxy Session SID identifies a Session resource and uses the KC prefix with 32 hexadecimal characters.

• The Session SID value does not match the required KC SID format or length for a Proxy Session resource.
• You used a different resource SID where a Session SID is required, such as a Service SID with the KS prefix or a Participant SID with the KP prefix.
• The sid or SessionSid request parameter for a Proxy endpoint was populated with a value that does not identify a Session resource.
• The Session SID was copied, stored, or passed incorrectly in your application and no longer matches the required Session SID pattern.

• Use the sid returned when you create or fetch the Proxy Session. A valid Session SID begins with KC.
• Validate the Session SID in your application before sending the request. Ensure it matches ^KC[0-9a-fA-F]{32}$.
• Keep the Service SID and Session SID in the correct path parameters. Use the Service SID for /Services/{ServiceSid} and the Session SID for /Sessions/{Sid} or /Sessions/{SessionSid}.
• If you are calling a Participant endpoint, pass the Session SID in SessionSid and the Participant SID in Sid. Do not swap those values.

• Proxy Session resource
• Proxy Participant resource
• Proxy quickstart