Failed to execute 'subscribe' on 'PushManager': Subscription failed - no active Service Worker

TL;DR

Upgrade the Firebase JS SDK to 11.1.0 or later. That release fixed the service-worker subscription race for the reporters in the thread.

The error

Failed to execute 'subscribe' on 'PushManager': Subscription failed - no active Service Worker

Intermittent when calling getToken from Firebase Cloud Messaging.

Fix it

1. Check your Firebase JS SDK version:

   npm ls firebase

   Success check: the version is below 11.1.0, confirming you are affected.

2. Upgrade to 11.1.0 or later:

   npm install firebase@^11.1.0

   Success check: npm ls firebase shows 11.1.0+.

3. Retry getToken. Success check: the token resolves with no PushManager error.

When this applies

• Firebase JS SDK below 11.1.0, getToken intermittently throws the PushManager error.
• Next.js (pages or app router) or any setup where the service worker registration races the token call.

When it does not apply

• Permission denied; the user blocked notifications (different error).
• VAPID key misconfiguration.
• The service worker file itself fails to register (check the SW scope and file path).

Compatibility

• firebase JS SDK 11.1.0+ (fixed). Affects all browsers; reported on macOS with Next.js 13.

Variant phrasings

• Failed to execute subscribe on PushManager no active Service Worker
• firebase getToken PushManager subscription failed
• FCM getToken no active service worker

Why it happens

getToken called pushManager.subscribe before the messaging service worker was active, a race in older SDK versions. 11.1.0 waits for the worker to be ready before subscribing.

Edge cases

• If it persists on 11.1.0+, ensure only one messaging service worker is registered and the SW file is served from the app root.
• Source: https://github.com/firebase/firebase-js-sdk/issues/7575

In gh:firebase/firebase-js-sdk#7575, the reporter ran into: Issue firebase/firebase-js-sdk#7575 (closed, 78 comments): ### Operating System MacOS ### Browser Version All browser ### Firebase SDK Version 10.2.0 ### Firebase SDK Product: Messaging ### Describe your project's tooling Nextjs 13 with Page setup. Example Repo -> https://github.com/2manoj1/nextjs-firebase-example/tree/main ### Describe the problem Same problem as https://github.com/firebase/firebase-js-sdk/issues/5797 Sometimes calling messaging getToken returns the error: Failed to execute 'subscribe' on 'PushManager': Subscription failed - no active Service Worker. The verified answer was: Upgrade the Firebase JS SDK to 11.1.0 or later. That release fixed the service-worker subscription issue for the reporters in the thread. Source issue: https://github.com/firebase/firebase-js-sdk/issues/7575