Use config() instead of env()

resources/views/app/video/call.blade.php

@@ -100,7 +100,7 @@
                 data: {
 
                     agoraClient: null,
-                    appId: '{{ env('AGORA_APPID') }}',
+                    appId: '{{ config('AGORA_APPID') }}',
                     channel: '{{ $client ? $client->uid : '' }}',
                     uid: '{{ $session->id + 1000000 }}',