diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87d650cd..9a11a637 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [Unreleased]
+
+### Fixes
+- Midea: MSmartHome-Cloud-Login — Anfrage-Felder `format`/`clientType`/`platform` jetzt als Zahlen (statt Strings) gemäß Referenz; behebt die Cloud-Ablehnung „value is illegal". Fehlermeldungen führen nun den Midea-Fehlercode mit.
+
+---
+
 ## [1.103.0] — 2026-06-26
 
 ### Features
diff --git a/src/services/midea/mideaCloud.js b/src/services/midea/mideaCloud.js
index f1f42cde..9a68cc0f 100644
--- a/src/services/midea/mideaCloud.js
+++ b/src/services/midea/mideaCloud.js
@@ -119,8 +119,11 @@ class MideaCloud {
     const body = opts.raw ? data : {
       appId: c.appId,
       src: c.appId,
-      format: '2',
-      clientType: '1',
+      // NUMERIC types per cloud.py BaseCloud.FORMAT=2 / CLIENT_TYPE=1 (NOT strings):
+      // the Midea cloud validates these strictly and answers "value is illegal"
+      // when they arrive JSON-encoded as "2"/"1".
+      format: 2,
+      clientType: 1,
       language: 'en_US',
       deviceId: this.deviceId,
       stamp: timestamp(),
@@ -152,7 +155,9 @@ class MideaCloud {
     if (m.includes('2fa') || m.includes('verification') || m.includes('captcha')) {
       return new MideaCloudError(msg || '2FA required', 'MIDEA_CLOUD_2FA_REQUIRED');
     }
-    return new MideaCloudError(msg || `cloud error ${code}`, 'MIDEA_CLOUD_ERROR');
+    // Surface the Midea error code so an unverified cloud schema can be diagnosed
+    // from the user-visible message (e.g. "value is illegal (Midea-Code 1010)").
+    return new MideaCloudError(`${msg || 'cloud error'} (Midea-Code ${code})`, 'MIDEA_CLOUD_ERROR');
   }
 
   async _getLoginId(account) {
@@ -204,13 +209,13 @@ class MideaCloud {
       // request cloud.py does NOT pass through _build_request_body).
       const r = await this._request('/mj/user/login', {
         data: {
-          platform: '2',
+          platform: 2,            // BaseCloud.FORMAT (number), cloud.py:283
           deviceId: this.deviceId,
         },
         iotData: {
           appId: this.cfg.appId,
           src: this.cfg.appId,
-          clientType: '1',
+          clientType: 1,          // BaseCloud.CLIENT_TYPE (number), cloud.py:289
           loginAccount: email,
           iampwd: this._hashIamPassword(loginId, password),
           password: this._hashPassword(loginId, password),
diff --git a/tests/midea_cloud.test.js b/tests/midea_cloud.test.js
index 2ac32382..086057da 100644
--- a/tests/midea_cloud.test.js
+++ b/tests/midea_cloud.test.js
@@ -34,6 +34,26 @@ test('getToken builds idBytes for both endians without RangeError', async () =>
   assert.equal(calls.length, 2);
 });
 
+test('MSmartHome request body sends NUMERIC format/clientType (cloud.py types)', async () => {
+  const c = new cloud.MideaCloud('msmarthome');
+  let sent;
+  const origFetch = global.fetch;
+  global.fetch = async (_url, opts) => { sent = JSON.parse(opts.body); return { status: 200, json: async () => ({ code: '0', data: {} }) }; };
+  try {
+    await c._requestMSmart('/v1/user/login/id/get', { loginAccount: 'a@b.de' });
+  } finally { global.fetch = origFetch; }
+  // The Midea cloud rejects "2"/"1" (strings) with "value is illegal" — these must be numbers.
+  assert.strictEqual(sent.format, 2);
+  assert.strictEqual(sent.clientType, 1);
+  assert.equal(typeof sent.format, 'number');
+  assert.equal(typeof sent.clientType, 'number');
+  // common fields present + passthrough data merged
+  assert.equal(sent.appId, '1010');
+  assert.equal(sent.language, 'en_US');
+  assert.equal(sent.loginAccount, 'a@b.de');
+  assert.ok(sent.stamp && sent.reqId && sent.deviceId);
+});
+
 test('live login + listDevices', { skip: !process.env.GC_MIDEA_CLOUD }, async () => {
   const { email, password, app } = JSON.parse(process.env.GC_MIDEA_CLOUD);
   const c = new cloud.MideaCloud(app);