diff --git a/packages/auth/src/telegram/telegram-session-api.service.ts b/packages/auth/src/telegram/telegram-session-api.service.ts
index 457debc..b697a02 100644
--- a/packages/auth/src/telegram/telegram-session-api.service.ts
+++ b/packages/auth/src/telegram/telegram-session-api.service.ts
@@ -1,4 +1,4 @@
-import { Injectable, inject, Optional } from '@angular/core';
+import { Injectable, inject } from '@angular/core';
 import { HttpClient } from '@angular/common/http';
 import { Observable, of, catchError, map } from 'rxjs';
 import { AuthSession, WebSessionStart } from './models/session.model';
@@ -20,7 +20,7 @@ const DEFAULT_TELEGRAM_BOT_USERNAME = 'DexarSupport_bot';
 export class TelegramSessionApiService {
   private readonly http = inject(HttpClient);
   private readonly authApiUrl = inject(AUTH_API_URL);
-  @Optional() private readonly telegramBotUsername = inject(TELEGRAM_BOT_USERNAME, { optional: true });
+  private readonly telegramBotUsername = inject(TELEGRAM_BOT_USERNAME, { optional: true });
 
   createSession(): Observable<WebSessionStart> {
     const webSessionID = generateGuid();