try another PWA plugin,

debug .env on TEST/STAGING
improve /notify API

workbox-config.js

@@ -0,0 +1,34 @@
+importScripts('https://storage.googleapis.com/workbox-cdn/releases/6.4.1/workbox-sw.js');
+
+// Only import the modules you need; skip precaching and routing if not needed
+workbox.core.skipWaiting();
+workbox.core.clientsClaim();
+
+//workbox.precaching.cleanupOutdatedCaches();
+//disable precaching
+workbox.precaching.precacheAndRoute(self.__WB_MANIFEST);
+
+module.exports = {
+    // Other webpack config...
+    plugins: [
+        // Other plugins...
+        new InjectManifest({
+            // These are some common options, and not all are required.
+            // Consult the docs for more info.
+            exclude: [/.../, '...'],
+            maximumFileSizeToCacheInBytes: 1 * 1024 * 1024,
+            swSrc: './worker/index.js',
+        }),
+    ],
+};
+
+// Example: Set up push notification handling
+self.addEventListener('push', event => {
+    const data = event.data.json();
+    event.waitUntil(
+        self.registration.showNotification(data.title, {
+            body: data.message,
+            icon: '/path/to/icon.png'
+        })
+    );
+});