try another PWA plugin,

debug .env on TEST/STAGING
improve /notify API

worker/index.js

@@ -1,9 +1,11 @@
 'use strict'
 
-console.log('Service Worker Loaded...')
+console.log('Service Worker worker/index.js Loaded...')
+workbox.precaching.precacheAndRoute(self.__WB_MANIFEST);
 
 self.addEventListener('fetch', (event) => {
     try {
+        console.log('Fetch event for ', event.request.url);
         if (event.request.url.includes('/api/auth/callback/')) {
             // Use network only strategy for auth routes, or bypass SW completely
             event.respondWith(fetch(event.request));