diff --git a/src/auto-reply/reply/session.test.ts b/src/auto-reply/reply/session.test.ts
index e24262a0fa9..1b80294a978 100644
--- a/src/auto-reply/reply/session.test.ts
+++ b/src/auto-reply/reply/session.test.ts
@@ -2680,4 +2680,30 @@ describe("initSessionState internal channel routing preservation", () => {
     expect(result.sessionEntry.deliveryContext?.channel).toBe("whatsapp");
     expect(result.sessionEntry.deliveryContext?.to).toBe("+15555550123");
   });
+
+  it("uses the configured default account for persisted routing when AccountId is omitted", async () => {
+    const storePath = await createStorePath("default-account-routing-context-");
+    const cfg = {
+      session: { store: storePath },
+      channels: {
+        discord: {
+          defaultAccount: "work",
+        },
+      },
+    } as OpenClawConfig;
+
+    const result = await initSessionState({
+      ctx: {
+        Body: "hello",
+        SessionKey: "agent:main:discord:channel:24680",
+        OriginatingChannel: "discord",
+        OriginatingTo: "channel:24680",
+      },
+      cfg,
+      commandAuthorized: true,
+    });
+
+    expect(result.sessionEntry.lastAccountId).toBe("work");
+    expect(result.sessionEntry.deliveryContext?.accountId).toBe("work");
+  });
 });
diff --git a/src/auto-reply/reply/session.ts b/src/auto-reply/reply/session.ts
index d82761682ff..a3771f70d2a 100644
--- a/src/auto-reply/reply/session.ts
+++ b/src/auto-reply/reply/session.ts
@@ -66,6 +66,31 @@ function resolveExplicitSessionEndReason(
   return matchedResetTriggerLower === "/reset" ? "reset" : "new";
 }
 
+function resolveSessionDefaultAccountId(params: {
+  cfg: OpenClawConfig;
+  channelRaw?: string;
+  accountIdRaw?: string;
+  persistedLastAccountId?: string;
+}): string | undefined {
+  const explicit = params.accountIdRaw?.trim();
+  if (explicit) {
+    return explicit;
+  }
+  const persisted = params.persistedLastAccountId?.trim();
+  if (persisted) {
+    return persisted;
+  }
+  const channel = params.channelRaw?.trim().toLowerCase();
+  if (!channel) {
+    return undefined;
+  }
+  const channels = params.cfg.channels as Record<string, { defaultAccount?: unknown } | undefined>;
+  const configuredDefault = channels?.[channel]?.defaultAccount;
+  return typeof configuredDefault === "string" && configuredDefault.trim()
+    ? configuredDefault.trim()
+    : undefined;
+}
+
 function resolveStaleSessionEndReason(params: {
   entry: SessionEntry | undefined;
   freshness?: SessionFreshness;
@@ -507,7 +532,12 @@ export async function initSessionState(params: {
     persistedLastChannel: baseEntry?.lastChannel,
     sessionKey,
   });
-  const lastAccountIdRaw = ctx.AccountId || baseEntry?.lastAccountId;
+  const lastAccountIdRaw = resolveSessionDefaultAccountId({
+    cfg,
+    channelRaw: lastChannelRaw,
+    accountIdRaw: ctx.AccountId,
+    persistedLastAccountId: baseEntry?.lastAccountId,
+  });
   // Only fall back to persisted threadId for thread sessions.  Non-thread
   // sessions (e.g. DM without topics) must not inherit a stale threadId from a
   // previous interaction that happened inside a topic/thread.