diff --git a/apps/SeleniumService/selenium_MH_eligibilityHistoryCheckWorker.py b/apps/SeleniumService/selenium_MH_eligibilityHistoryCheckWorker.py
index c304f25a..bc22d80a 100644
--- a/apps/SeleniumService/selenium_MH_eligibilityHistoryCheckWorker.py
+++ b/apps/SeleniumService/selenium_MH_eligibilityHistoryCheckWorker.py
@@ -81,6 +81,30 @@ class AutomationMassHealthEligibilityHistoryCheck:
                 )
             )
             login_button.click()
+
+            # Wait for the SSO redirect. On some machines Chrome opens the dashboard
+            # in a new tab and closes the SSO tab — poll ALL window handles.
+            print("[login] Waiting for SSO redirect to provider.masshealth-dental.org ...")
+            deadline = time.time() + 30
+            found = False
+            while time.time() < deadline:
+                time.sleep(0.5)
+                for handle in self.driver.window_handles:
+                    try:
+                        self.driver.switch_to.window(handle)
+                        if self.driver.current_url.startswith("https://provider.masshealth-dental.org"):
+                            print(f"[login] Redirect complete. URL: {self.driver.current_url}")
+                            found = True
+                            break
+                    except Exception:
+                        continue
+                if found:
+                    break
+
+            if not found:
+                print("[login] Redirect timeout — portal window not found in any tab.")
+                return "ERROR: Login redirect timed out — check credentials or portal availability."
+
             return "Success"
         except Exception as e:
             print(f"[login] Error: {e}")
diff --git a/apps/SeleniumService/selenium_eligibilityCheckWorker.py b/apps/SeleniumService/selenium_eligibilityCheckWorker.py
index ce651dbc..019d664b 100755
--- a/apps/SeleniumService/selenium_eligibilityCheckWorker.py
+++ b/apps/SeleniumService/selenium_eligibilityCheckWorker.py
@@ -96,17 +96,28 @@ class AutomationMassHealthEligibilityCheck:
             login_button = wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR, "input[type='submit'][name='submit'][value='Login']")))
             login_button.click()
 
-            # Wait for SSO redirect to complete and land on the MassHealth portal.
-            # Must check the hostname only — the SSO URL itself contains "provider.masshealth-dental.org"
-            # as a query parameter, so a plain substring check would match too early.
+            # Wait for the SSO redirect to complete. On some machines Chrome opens
+            # the dashboard in a NEW tab and closes the SSO tab. Poll ALL open
+            # window handles so we find the portal regardless of which tab it lands on.
             print("[login] Waiting for SSO redirect to provider.masshealth-dental.org ...")
-            try:
-                WebDriverWait(self.driver, 30).until(
-                    lambda d: d.current_url.startswith("https://provider.masshealth-dental.org")
-                )
-                print(f"[login] Redirect complete. URL: {self.driver.current_url}")
-            except TimeoutException:
-                print(f"[login] Redirect timeout. Still on: {self.driver.current_url}")
+            deadline = time.time() + 30
+            found = False
+            while time.time() < deadline:
+                time.sleep(0.5)
+                for handle in self.driver.window_handles:
+                    try:
+                        self.driver.switch_to.window(handle)
+                        if self.driver.current_url.startswith("https://provider.masshealth-dental.org"):
+                            print(f"[login] Redirect complete. URL: {self.driver.current_url}")
+                            found = True
+                            break
+                    except Exception:
+                        continue
+                if found:
+                    break
+
+            if not found:
+                print("[login] Redirect timeout — portal window not found in any tab.")
                 return "ERROR: Login redirect timed out — check credentials or portal availability."
 
             if self._is_maintenance_page():