diff --git a/src/modules/reports/views/TelegramView.vue b/src/modules/reports/views/TelegramView.vue
index 4853953..d5eab8f 100644
--- a/src/modules/reports/views/TelegramView.vue
+++ b/src/modules/reports/views/TelegramView.vue
@@ -98,9 +98,9 @@ import axios from "axios";
 import MobileTopBar from '@shared/components/mobile/MobileTopBar.vue';
 import MobileBottomNav from '@shared/components/mobile/MobileBottomNav.vue';
 
-// Telegram API uses /api/telegram (separate from reports)
+// Telegram API uses BASE_URL prefix for IIS sub-app compatibility (/roa2web/ in prod)
 const telegramApi = axios.create({
-  baseURL: '/api/telegram',
+  baseURL: import.meta.env.BASE_URL + 'api/telegram',
   headers: { 'Content-Type': 'application/json' }
 });