diff --git a/src/gateway/server-methods/chat.ts b/src/gateway/server-methods/chat.ts
index 9010a6f21..dca2c54a9 100644
--- a/src/gateway/server-methods/chat.ts
+++ b/src/gateway/server-methods/chat.ts
@@ -362,7 +362,7 @@ export const chatHandlers: GatewayRequestHandlers = {
         return;
       }
     }
-    const { cfg, entry } = loadSessionEntry(p.sessionKey);
+    const { cfg, entry, canonicalKey } = loadSessionEntry(p.sessionKey);
     const timeoutMs = resolveAgentTimeoutMs({
       cfg,
       overrideMs: p.timeoutMs,
@@ -449,7 +449,7 @@ export const chatHandlers: GatewayRequestHandlers = {
         BodyForCommands: commandBody,
         RawBody: parsedMessage,
         CommandBody: commandBody,
-        SessionKey: p.sessionKey,
+        SessionKey: canonicalKey,
         Provider: INTERNAL_MESSAGE_CHANNEL,
         Surface: INTERNAL_MESSAGE_CHANNEL,
         OriginatingChannel: INTERNAL_MESSAGE_CHANNEL,