I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

I also ran into this error just as the OP described.

I am also getting this issue.

Thank for the report. I was able to reproduce this using the quick start guide and filed an internal report (b/144697421).

I'm just wondering if you y'all happen to consistently facing this issue. There are times that I can only reproduce it on the initial load or upon requesting permission several times. Are there any particular patterns you notice that significantly contributes to the issue (aside from what mentioned)?

Hi rommelpe,

This issue only arises after the a reset of notifications permissions and reload of page and then works properly with an additional reloaded pages. Aside from what I mentioned there are no other patterns that contribute to the issue identified.

Thanks, and let me know if there are any other questions.

I'm getting the same issue when I remove the push notifications permission and reload.

I am also getting this issue.

I'm getting the same error :(

Thanks for the report. I can consistently reproduce the behavior and I'm investigating the issue.

I'd like to ask everyone to please refrain from posting "This is happening to me too" comments and instead use the add reaction feature on the OP to add a thumbs up to issues that you consider important.

Any update on this issue?

Hello, sorry for the lack of updates. Looks like the problem is in our backend, but there wasn't much progress as we've had a code freeze last week (because of black friday). I should be able to give you a better update or even a fix later this week.

Can we have the latest updates regarding this issue?

Hey everyone, our backend team is still investigating this. Since it's taking longer than my initial estimate, I just submitted a PR to temporarily suppress this error.

Also reproduced this issue and need a fix
Using Firebase version 7.5.2

This is happening to me too

The temporary change to suppress the error, mentioned by @mmermerkaya above, is in 7.6.0 which has just been released.

Using 7.6.0 and am still having the same issue!

If you're only seeing the error in the console, that's normal. My PR is still logging the error in the console, but it should not stop the getToken call from completing successfully.

I am receiving a token value when https://firebaseinstallations.googleapis.com/v1/projects/.../authTokens:generate is called, but get a "500" error when calling getToken()

I get this error when using "127.0.0.1" instead of localhost.
BUT if i use "localhost" even the getToken() is not working. Showing CORS policy error.

• On localhost error is(cannot getToken())

OPTIONS https://firebaseinstallations.googleapis.com/v1/projects/{project_id}/installations/{some_token}/authTokens:generate 403

Access to fetch at 'https://firebaseinstallations.googleapis.com/v1/projects/{project_id}/installations/{some_token}/authTokens:generate' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

• On 127.0.0.1 error(getting token but shows this error) is:

DELETE https://fcmregistrations.googleapis.com/v1/projects/{project_id}/regis.../{FCM_token} 500

FirebaseError: Messaging: A problem occured while unsubscribing the user from FCM: Internal error encountered. (messaging/token-unsubscribe-failed). (messaging/token-unsubscribe-failed).

The CORS error looks like an unrelated issue. Can you create a new bug report for that?

@mmermerkaya did you created new issue for CORS problem?
I'm having the same issue.

@Ridermansb @mmermerkaya @GoktuqCan @CodeByBryan could you check if #2467 matches the issue that you are observing?

I am having the issue in a Chrome Extension. when getToken() is called I recieve:

DELETE https://fcmregistrations.googleapis.com/v1/projects/{project_id}/regis.../{FCM_token} 500
FirebaseError: Messaging: A problem occured while unsubscribing the user from FCM: Internal error encountered. (messaging/token-unsubscribe-failed).
(messaging/token-unsubscribe-failed).<

I am not getting any CORS errors

I do have to say, I just realised that that my issue was specific to getting the token.
The error was: messaging/token-subscribe-failed, http code=401.
whereas this issue is about unsubscribe and http code=500.

For future visitors: Goto Dev Tools -> Application -> Clear storage.

I feel like this issue only takes place when you disable notifications and enable them again. The fact that the service worker is registered again can also be a culprit in some form, but just unregistering the service worker did not solve the problem for me. My firebase version is 7.9.1, so I guess the issue still persists but it does not affect anything critically.

I tried this solution. It is fixed, but when you disable and enable the status for browser notification, it happens again.
thanks @Symasia

Hi y'all,

We've had this problem (or related ones) for a long time. I think I finally got it all working today. This is how.

I believe Firebase messaging is just buggy when you try to register your own service worker instead of providing the firebase-messaging-sw.js file.

So the fix was to create that file and then reference at the end of my own service-worker.js:

importScripts('firebase-messaging-sw.js')

Then you no longer need to pass serviceWorkerRegistration into getToken, simply call:

const token = await messaging.getToken({ vapidKey: config.publicVapidKey })

And it just works!

I'm having exactly the same issue

FirebaseError: Messaging: A problem occurred while unsubscribing the user from FCM

Using "firebase": "8.3.2"

It seems like this issue takes place due to cache errors. So to fix it I am always clearing cache, that's pity :(

Unfortunately I don't have an ability to use firebase-messaging-sw.js, that's why @jahooma method wont work for me

I'm getting this error on Chrome and not in Firefox. if that helps

Have the same issue (404) with the 8.3.1 please guide me how can i fix this issue

I'm using firebase-messaging-sw.js and still can reproduce this bug using @sergdenisov 's two method, so I think @jahooma 's method is not working.

My firebase SDK is 9.6.1

This issue still persists and only way to "temporarily" solve it is to clear storage.
firebase v9.6.7

I get this error also with firebase v9.6.10 in Chrome but not in Firefox!

_FirebaseError: Messaging: A problem occurred while unsubscribing the user from FCM: FirebaseError: Messaging: A problem occurred while unsubscribing the user from FCM: Requested entity was not found. (messaging/token-unsubscribe-failed). (messaging/token-unsubscribe-failed).
at index.esm2017.js:428:29
at Generator.next ()
at asyncGeneratorStep (asyncToGenerator.js:3:1)
at _next (asyncToGenerator.js:25:1)
at _ZoneDelegate.invoke (zone.js:372:1)
at Object.onInvoke (core.mjs:25568:33)
at _ZoneDelegate.invoke (zone.js:371:1)
at Zone.run (zone.js:134:1)
at zone.js:1275:1
at ZoneDelegate.invokeTask (zone.js:406:1)

I can confirm the clearing the application storage on the developer console solves the problem temporarily, but it is not the best solution.

This is happening to me aswell with version Firebase JS SDK 9.9.0 wrapped within Flutter Firebase SDK.

It happens really often while testing PWA and browser navigation. It seems like the Firebase SDK is returning an already deleted token no matter what. Even if in the code there is a call to get a new token, it's returning the same invalid token.

Same issue

This worked for me https://github.com/firebase/firebase-js-sdk/issues/2643#issuecomment-596817538

@jaysonmulwa the comment you posted link to seems not be there anymore. Can you tell what was the solution mentioned in it?

Hi @srihari9n , It's been quite a while, will try to recall what the solution was.

I'm seeing this randomly as well. When this happened back in 2021 it ended up being a backend issue on Google's side that they fixed. See: #5081

I'm wondering if there was a regression and it's happening again?

@jaysonmulwa if you can remember the work around we'd be able to use it as well.

Have the same issue (404) with the 8.4.1 version. Found 2 ways to reproduce (2-nd step):

1. Everything is OK with an app registration and getting a token.
2. Block notifications, then allow notifications (without reloading a page) OR unregister your service worker in browser settings.
3. Reload a page.

It still work for me in 2023 ✌️ Thanks Mwamiq381

Seeing the same issues on 9.17.1 as well

I'm having the same issue. Version 9.20.1. Actually the error appears when I remove the notification permissions in my browser and try to get a new token then. But still the new token works as expected

this error is still producing in the firebase version ^9.22.2 and also it should be fixed.

Have it

Not actual problem.

Just save and check token in database.

this is an annoying bug.

the issue is produced in the Firebase version ^10.1.0

Still able to reproduce. Why is it taking so long to fix this?

Any news? 🥲

I encountered this error about a month ago, and it was really frustrating. After multiple debugging attempts, I was able to fix it, and I haven't encountered it since. Although I'm not certain about the root cause of this error, I suspect it was triggered by changes in the idToken. Changing the idToken seemed to lead to the issue of unregistering the FCM token. After reviewing the places where getIdTokenResult and getIdToken were used, especially when setting forceRefresh to true, which caused a change in the idToken, the error no longer occurred. I don't recall the details, but the problem seemed to be related to modifying the idToken. I hope this information can help someone else eliminate a similar issue.

When we update the site permissions from browser settings (while our website is not active), for example, I changed the notification permission to Blocked from Allow, and then back to Allow, now I'd expect to start receiving push notifications (right?). But the fcm v1 api returns 'Requested entity not found'. I believe it's a similar case as resetting the permissions as @thomasmburke has mentioned.

In any case in the source code, the error has been quietly handled. Is there any update here, team firebase?