diff --git a/src/api/teamsbotApi.ts b/src/api/teamsbotApi.ts
index aca4d71..4ba16c9 100644
--- a/src/api/teamsbotApi.ts
+++ b/src/api/teamsbotApi.ts
@@ -115,6 +115,31 @@ export interface VoiceOption {
   naturalSampleRateHertz: number;
 }
 
+// Auth Detection Test Types
+export interface AuthTestResult {
+  variantId: string;
+  variantName: string;
+  success: boolean;
+  pageType: 'v2' | 'lightMeetings' | 'error' | 'unknown';
+  finalUrl: string;
+  hasSignInLink: boolean;
+  hasNameInput: boolean;
+  hasJoinButton: boolean;
+  authAttempted: boolean;
+  authSuccess: boolean | null;
+  screenshot?: string;
+  durationMs: number;
+  error?: string;
+  detectedSignals: string[];
+}
+
+export interface AuthTestResults {
+  meetingUrl: string;
+  timestamp: string;
+  variants: AuthTestResult[];
+  recommendation: string;
+}
+
 // SSE Event Types
 export interface TeamsbotSSEEvent {
   type: 'transcript' | 'botResponse' | 'analysis' | 'suggestedResponse' | 'statusChange' | 'error' | 'ping' | 'sessionState';
@@ -281,6 +306,19 @@ export async function fetchVoices(languageCode: string): Promise<VoiceOption[]>
   }
 }
 
+/**
+ * Run auth detection tests against a Teams meeting URL.
+ * Tests 5 browser configuration variants to determine which ones
+ * receive the /v2/ (authenticated) vs light-meetings (anonymous) page.
+ * Does NOT join the meeting.
+ */
+export async function testAuth(instanceId: string, meetingUrl: string): Promise<AuthTestResults> {
+  const response = await api.post(`/api/teamsbot/${instanceId}/test-auth`, { meetingUrl }, {
+    timeout: 300000, // 5 minutes — tests run sequentially
+  });
+  return response.data;
+}
+
 /**
  * Create an SSE EventSource for live session streaming.
  * Returns the EventSource instance for the caller to manage.
diff --git a/src/pages/views/teamsbot/Teamsbot.module.css b/src/pages/views/teamsbot/Teamsbot.module.css
index deab067..cfc6997 100644
--- a/src/pages/views/teamsbot/Teamsbot.module.css
+++ b/src/pages/views/teamsbot/Teamsbot.module.css
@@ -495,3 +495,247 @@
   justify-content: flex-end;
   padding-top: 1rem;
 }
+
+/* ============================================================================
+   Auth Detection Test Section
+   ============================================================================ */
+
+.testSection {
+  margin-bottom: 2rem;
+  padding: 1.25rem;
+  border: 1px solid var(--primary-color, #4A90D9);
+  border-radius: 8px;
+  background: rgba(74, 144, 217, 0.04);
+}
+
+.testSectionHeader {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-bottom: 0.75rem;
+}
+
+.testSectionTitle {
+  margin: 0;
+  font-size: 1rem;
+  font-weight: 600;
+  color: var(--primary-color, #4A90D9);
+}
+
+.testInputRow {
+  display: flex;
+  gap: 0.5rem;
+  align-items: flex-start;
+  margin-bottom: 0.75rem;
+}
+
+.testInputRow .input {
+  flex: 1;
+}
+
+.testButton {
+  padding: 0.5rem 1.25rem;
+  background: var(--primary-color, #4A90D9);
+  color: #fff;
+  border: none;
+  border-radius: 6px;
+  font-size: 0.85rem;
+  font-weight: 500;
+  cursor: pointer;
+  white-space: nowrap;
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  transition: background 0.2s;
+}
+
+.testButton:hover {
+  background: var(--primary-hover, #3A7BC8);
+}
+
+.testButton:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+.testProgress {
+  font-size: 0.85rem;
+  color: var(--text-secondary, #666);
+  padding: 0.75rem 0;
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.testResultsTable {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 0.85rem;
+  margin-top: 0.75rem;
+}
+
+.testResultsTable th {
+  text-align: left;
+  padding: 0.5rem 0.75rem;
+  border-bottom: 2px solid var(--border-color, #e0e0e0);
+  font-weight: 600;
+  font-size: 0.8rem;
+  color: var(--text-secondary, #666);
+  white-space: nowrap;
+}
+
+.testResultsTable td {
+  padding: 0.5rem 0.75rem;
+  border-bottom: 1px solid var(--border-color, #e0e0e0);
+  vertical-align: middle;
+}
+
+.testResultsTable tr:last-child td {
+  border-bottom: none;
+}
+
+.testBadgeV2 {
+  display: inline-block;
+  padding: 0.15rem 0.5rem;
+  border-radius: 10px;
+  font-size: 0.75rem;
+  font-weight: 600;
+  background: rgba(74, 217, 154, 0.15);
+  color: #2D8E5C;
+}
+
+.testBadgeLightMeetings {
+  display: inline-block;
+  padding: 0.15rem 0.5rem;
+  border-radius: 10px;
+  font-size: 0.75rem;
+  font-weight: 600;
+  background: rgba(217, 168, 74, 0.15);
+  color: #B8860B;
+}
+
+.testBadgeError {
+  display: inline-block;
+  padding: 0.15rem 0.5rem;
+  border-radius: 10px;
+  font-size: 0.75rem;
+  font-weight: 600;
+  background: rgba(217, 74, 74, 0.15);
+  color: #D94A4A;
+}
+
+.testBadgeUnknown {
+  display: inline-block;
+  padding: 0.15rem 0.5rem;
+  border-radius: 10px;
+  font-size: 0.75rem;
+  font-weight: 600;
+  background: rgba(128, 128, 128, 0.15);
+  color: #666;
+}
+
+.testCheckmark {
+  color: #2D8E5C;
+  font-weight: 600;
+}
+
+.testCross {
+  color: #D94A4A;
+  font-weight: 600;
+}
+
+.testDash {
+  color: var(--text-tertiary, #999);
+}
+
+.testRecommendation {
+  margin-top: 0.75rem;
+  padding: 0.75rem 1rem;
+  background: rgba(74, 144, 217, 0.08);
+  border-radius: 6px;
+  font-size: 0.85rem;
+  line-height: 1.5;
+  color: var(--text-primary, #333);
+  border-left: 3px solid var(--primary-color, #4A90D9);
+}
+
+.testScreenshotButton {
+  padding: 0.15rem 0.5rem;
+  border: 1px solid var(--border-color, #e0e0e0);
+  border-radius: 4px;
+  background: var(--surface-color, #fff);
+  color: var(--primary-color, #4A90D9);
+  font-size: 0.75rem;
+  cursor: pointer;
+  white-space: nowrap;
+}
+
+.testScreenshotButton:hover {
+  background: var(--surface-alt, #f5f5f5);
+}
+
+.testScreenshotOverlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(0, 0, 0, 0.7);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+  cursor: pointer;
+}
+
+.testScreenshotImage {
+  max-width: 90vw;
+  max-height: 85vh;
+  border-radius: 8px;
+  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
+}
+
+.testScreenshotCaption {
+  position: fixed;
+  bottom: 2rem;
+  left: 50%;
+  transform: translateX(-50%);
+  color: #fff;
+  font-size: 0.9rem;
+  background: rgba(0, 0, 0, 0.6);
+  padding: 0.5rem 1rem;
+  border-radius: 6px;
+}
+
+.testErrorText {
+  font-size: 0.75rem;
+  color: var(--danger-color, #D94A4A);
+  max-width: 200px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.testVariantName {
+  font-weight: 500;
+}
+
+.testDuration {
+  font-size: 0.8rem;
+  color: var(--text-tertiary, #999);
+  white-space: nowrap;
+}
+
+.testSignals {
+  font-size: 0.75rem;
+  color: var(--text-tertiary, #999);
+  max-width: 250px;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}
+
+.spinner {
+  animation: spin 1s linear infinite;
+}
diff --git a/src/pages/views/teamsbot/TeamsbotSettingsView.tsx b/src/pages/views/teamsbot/TeamsbotSettingsView.tsx
index c30cbf1..b64a427 100644
--- a/src/pages/views/teamsbot/TeamsbotSettingsView.tsx
+++ b/src/pages/views/teamsbot/TeamsbotSettingsView.tsx
@@ -1,8 +1,8 @@
 import React, { useState, useEffect, useCallback, useRef } from 'react';
 import { useCurrentInstance } from '../../../hooks/useCurrentInstance';
 import * as teamsbotApi from '../../../api/teamsbotApi';
-import type { TeamsbotConfig, ConfigUpdateRequest, VoiceOption } from '../../../api/teamsbotApi';
-import { FaPlay, FaSpinner } from 'react-icons/fa';
+import type { TeamsbotConfig, ConfigUpdateRequest, VoiceOption, AuthTestResults, AuthTestResult } from '../../../api/teamsbotApi';
+import { FaPlay, FaSpinner, FaFlask, FaImage } from 'react-icons/fa';
 import styles from './Teamsbot.module.css';
 
 /** Format voice name for display: "de-DE-Wavenet-A" -> "Wavenet A" + gender */
@@ -37,6 +37,13 @@ export const TeamsbotSettingsView: React.FC = () => {
   const [voices, setVoices] = useState<VoiceOption[]>([]);
   const [loadingVoices, setLoadingVoices] = useState(false);
 
+  // Auth detection test state
+  const [testMeetingUrl, setTestMeetingUrl] = useState('');
+  const [testRunning, setTestRunning] = useState(false);
+  const [testResults, setTestResults] = useState<AuthTestResults | null>(null);
+  const [testError, setTestError] = useState<string | null>(null);
+  const [screenshotPreview, setScreenshotPreview] = useState<{ src: string; caption: string } | null>(null);
+
   const _loadConfig = useCallback(async () => {
     if (!instanceId) return;
     try {
@@ -142,6 +149,46 @@ export const TeamsbotSettingsView: React.FC = () => {
     }
   };
 
+  const _handleRunAuthTest = async () => {
+    if (!instanceId || !testMeetingUrl.trim()) return;
+    setTestRunning(true);
+    setTestResults(null);
+    setTestError(null);
+
+    try {
+      const results = await teamsbotApi.testAuth(instanceId, testMeetingUrl.trim());
+      setTestResults(results);
+    } catch (err: any) {
+      setTestError(err.message || 'Auth-Test fehlgeschlagen');
+    } finally {
+      setTestRunning(false);
+    }
+  };
+
+  const _getPageTypeBadge = (result: AuthTestResult) => {
+    switch (result.pageType) {
+      case 'v2':
+        return <span className={styles.testBadgeV2}>/v2/</span>;
+      case 'lightMeetings':
+        return <span className={styles.testBadgeLightMeetings}>light-meetings</span>;
+      case 'error':
+        return <span className={styles.testBadgeError}>Fehler</span>;
+      default:
+        return <span className={styles.testBadgeUnknown}>Unbekannt</span>;
+    }
+  };
+
+  const _getCheckmark = (value: boolean) => {
+    return value
+      ? <span className={styles.testCheckmark}>&#10003;</span>
+      : <span className={styles.testCross}>&#10007;</span>;
+  };
+
+  const _formatDuration = (ms: number) => {
+    if (ms < 1000) return `${ms}ms`;
+    return `${(ms / 1000).toFixed(1)}s`;
+  };
+
   if (loading) return <div className={styles.loading}>Lade Konfiguration...</div>;
 
   return (
@@ -152,6 +199,127 @@ export const TeamsbotSettingsView: React.FC = () => {
         {error && <div className={styles.errorBanner}>{error}</div>}
         {successMsg && <div className={styles.successBanner}>{successMsg}</div>}
 
+        {/* Auth Detection Test */}
+        <div className={styles.testSection}>
+          <div className={styles.testSectionHeader}>
+            <FaFlask />
+            <h4 className={styles.testSectionTitle}>Auth-Erkennung testen</h4>
+          </div>
+          <span className={styles.hint}>
+            Testet 5 Browser-Konfigurationen gegen einen aktiven Teams-Call.
+            Prueft ob Teams /v2/ (Auth moeglich) oder light-meetings (anonym erzwungen) liefert.
+            Der Bot tritt dem Meeting NICHT bei.
+          </span>
+
+          <div className={styles.testInputRow} style={{ marginTop: '0.75rem' }}>
+            <input
+              type="url"
+              className={styles.input}
+              value={testMeetingUrl}
+              onChange={(e) => setTestMeetingUrl(e.target.value)}
+              placeholder="https://teams.microsoft.com/meet/..."
+              disabled={testRunning}
+            />
+            <button
+              className={styles.testButton}
+              onClick={_handleRunAuthTest}
+              disabled={testRunning || !testMeetingUrl.trim()}
+            >
+              {testRunning ? <FaSpinner className={styles.spinner} /> : <FaFlask />}
+              {testRunning ? 'Teste...' : 'Testen'}
+            </button>
+          </div>
+
+          {testRunning && (
+            <div className={styles.testProgress}>
+              <FaSpinner className={styles.spinner} />
+              5 Varianten werden sequentiell getestet (~2-3 Minuten)...
+            </div>
+          )}
+
+          {testError && <div className={styles.errorBanner}>{testError}</div>}
+
+          {testResults && (
+            <>
+              <table className={styles.testResultsTable}>
+                <thead>
+                  <tr>
+                    <th>Variante</th>
+                    <th>Seite</th>
+                    <th>Sign-in</th>
+                    <th>Name-Input</th>
+                    <th>Join</th>
+                    <th>Auth</th>
+                    <th>Dauer</th>
+                    <th></th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {testResults.variants.map((result) => (
+                    <tr key={result.variantId}>
+                      <td>
+                        <span className={styles.testVariantName}>{result.variantName}</span>
+                        {result.error && (
+                          <div className={styles.testErrorText} title={result.error}>
+                            {result.error}
+                          </div>
+                        )}
+                      </td>
+                      <td>{_getPageTypeBadge(result)}</td>
+                      <td>{result.success ? _getCheckmark(result.hasSignInLink) : <span className={styles.testDash}>—</span>}</td>
+                      <td>{result.success ? _getCheckmark(result.hasNameInput) : <span className={styles.testDash}>—</span>}</td>
+                      <td>{result.success ? _getCheckmark(result.hasJoinButton) : <span className={styles.testDash}>—</span>}</td>
+                      <td>
+                        {result.authAttempted
+                          ? (result.authSuccess ? <span className={styles.testCheckmark}>Erfolgreich</span> : <span className={styles.testCross}>Fehlgeschlagen</span>)
+                          : <span className={styles.testDash}>—</span>
+                        }
+                      </td>
+                      <td><span className={styles.testDuration}>{_formatDuration(result.durationMs)}</span></td>
+                      <td>
+                        {result.screenshot && (
+                          <button
+                            className={styles.testScreenshotButton}
+                            onClick={() => setScreenshotPreview({
+                              src: `data:image/jpeg;base64,${result.screenshot}`,
+                              caption: result.variantName,
+                            })}
+                          >
+                            <FaImage /> Bild
+                          </button>
+                        )}
+                      </td>
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+
+              {testResults.recommendation && (
+                <div className={styles.testRecommendation}>
+                  <strong>Empfehlung:</strong> {testResults.recommendation}
+                </div>
+              )}
+            </>
+          )}
+        </div>
+
+        {/* Screenshot Overlay */}
+        {screenshotPreview && (
+          <div
+            className={styles.testScreenshotOverlay}
+            onClick={() => setScreenshotPreview(null)}
+          >
+            <img
+              src={screenshotPreview.src}
+              alt={screenshotPreview.caption}
+              className={styles.testScreenshotImage}
+            />
+            <div className={styles.testScreenshotCaption}>
+              {screenshotPreview.caption} — Klicken zum Schliessen
+            </div>
+          </div>
+        )}
+
         {/* Bot Identity */}
         <div className={styles.settingsSection}>
           <h4 className={styles.sectionTitle}>Bot-Identitaet</h4>