diff --git a/extensions/twitch/src/setup-surface.test.ts b/extensions/twitch/src/setup-surface.test.ts
index 4336782eb9a..967eb3cfba2 100644
--- a/extensions/twitch/src/setup-surface.test.ts
+++ b/extensions/twitch/src/setup-surface.test.ts
@@ -313,20 +313,40 @@ describe("setup surface helpers", () => {
   });
 
   describe("setup wizard account routing", () => {
-    it("normalizes account ids before using them as config keys", () => {
-      const cfg = setTwitchAccount(
-        {} as Parameters<typeof setTwitchAccount>[0],
-        {
-          username: "normalized-bot",
-          accessToken: "oauth:normalized",
-          clientId: "normalized-client",
-          channel: "#normalized",
-        },
-        "__proto__",
-      );
+    it("rejects reserved account ids before using them as config keys", () => {
+      expect(() =>
+        setTwitchAccount(
+          {} as Parameters<typeof setTwitchAccount>[0],
+          {
+            username: "reserved-bot",
+            accessToken: "oauth:reserved",
+            clientId: "reserved-client",
+            channel: "#reserved",
+          },
+          "__proto__",
+        ),
+      ).toThrow("Invalid Twitch account id");
 
-      expect(cfg.channels?.twitch?.accounts?.default?.username).toBe("normalized-bot");
       expect(Object.prototype).not.toHaveProperty("username");
+    });
+
+    it("rejects reserved account ids before env-token writes", async () => {
+      await expect(
+        configureWithEnvToken(
+          {} as Parameters<typeof configureWithEnvToken>[0],
+          mockPrompter,
+          null,
+          "oauth:fromenv",
+          false,
+          {} as Parameters<typeof configureWithEnvToken>[5],
+          "__proto__",
+        ),
+      ).rejects.toThrow("Invalid Twitch account id");
+
+      expect(mockPromptConfirm).not.toHaveBeenCalled();
+    });
+
+    it("normalizes account ids before rendering status lines", () => {
       expect(
         twitchSetupWizard.status?.resolveStatusLines?.({
           cfg: {},
diff --git a/extensions/twitch/src/setup-surface.ts b/extensions/twitch/src/setup-surface.ts
index 2ad4f540989..a464929c4a7 100644
--- a/extensions/twitch/src/setup-surface.ts
+++ b/extensions/twitch/src/setup-surface.ts
@@ -2,6 +2,7 @@
  * Twitch setup wizard surface for CLI setup.
  */
 
+import { normalizeOptionalAccountId } from "openclaw/plugin-sdk/account-id";
 import { getChatChannelMeta, type ChannelPlugin } from "openclaw/plugin-sdk/core";
 import {
   formatDocsLink,
@@ -23,11 +24,20 @@ import type { TwitchAccountConfig, TwitchRole } from "./types.js";
 import { isAccountConfigured } from "./utils/twitch.js";
 
 const channel = "twitch" as const;
+const INVALID_ACCOUNT_ID_MESSAGE = "Invalid Twitch account id";
+
+function normalizeRequestedSetupAccountId(accountId: string): string {
+  const normalized = normalizeOptionalAccountId(accountId);
+  if (!normalized) {
+    throw new Error(INVALID_ACCOUNT_ID_MESSAGE);
+  }
+  return normalized;
+}
 
 function resolveSetupAccountId(cfg: OpenClawConfig, requestedAccountId?: string): string {
   const requested = requestedAccountId?.trim();
   if (requested) {
-    return normalizeAccountId(requested);
+    return normalizeRequestedSetupAccountId(requested);
   }
 
   const preferred = cfg.channels?.twitch?.defaultAccount?.trim();
@@ -39,7 +49,9 @@ export function setTwitchAccount(
   account: Partial<TwitchAccountConfig>,
   accountId: string = resolveSetupAccountId(cfg),
 ): OpenClawConfig {
-  const resolvedAccountId = normalizeAccountId(accountId);
+  const resolvedAccountId = accountId.trim()
+    ? normalizeRequestedSetupAccountId(accountId)
+    : resolveSetupAccountId(cfg);
   const existing = getAccountConfig(cfg, resolvedAccountId);
   const merged: TwitchAccountConfig = {
     username: account.username ?? existing?.username ?? "",
@@ -208,7 +220,9 @@ export async function configureWithEnvToken(
   dmPolicy: ChannelSetupDmPolicy,
   accountId: string = resolveSetupAccountId(cfg),
 ): Promise<{ cfg: OpenClawConfig } | null> {
-  const resolvedAccountId = normalizeAccountId(accountId);
+  const resolvedAccountId = accountId.trim()
+    ? normalizeRequestedSetupAccountId(accountId)
+    : resolveSetupAccountId(cfg);
   if (resolvedAccountId !== DEFAULT_ACCOUNT_ID) {
     return null;
   }