Web推送通知未注册错误（仅限生产中）

Question

I've been working on push notifications using the web-push-php library (https://github.com/web-push-libs/web-push-php) and the only problem is trigerring the notifications. Everything works correctly on my local website but when I uploaded it to a server I get "NotRegistered" error back from https://fcm.googleapis.com/fcm/send/

Any idea how to solve this?

Thanks in advance