Zero devices registered

If user unsubscribed push notification for the site then that particular token will get automatically deleted. Whether you are using webview app or normal website? No one reported this problem, It will have all subscribed tokens Device tokens list, if you need more help, please get it from plugin help

Please let me know your site url, i will look into it. If you use iOS or safari browser older version then web push notification will not be supported

• This reply was modified 3 years, 6 months ago by Murali.

I found in your website Firebase applicationServerKey is invalid. DOMException: Failed to execute ‘subscribe’ on ‘PushManager’: The provided applicationServerKey is not valid in the console log. Please make sure all firebase credentials are correct
Sign in to Firebase, then open your project, click settings icon & select Project settings
To get Firebase server key (for field 1 in admin firebase settings)
project settings > cloud messaging tab > get server key or add server key button to get server key
To get Firebase config fields (for fields 2 to 8 in admin firebase settings)
If you do not have web app, Create a new web app. After creating a new app, it will show firebase config fields
Project settings > General under your apps section > click on config button to view configuration fields
To get Firebase public key (for field 9 in admin firebase settings)
Open the Cloud Messaging tab of the Firebase console Settings pane and scroll to the Web configuration section
project settings > cloud messaging tab > Under web push certificates > Generate key pair to get public key
In the Web Push certificates tab, click Generate Key Pair. The console displays a notice that the key pair was generated, and displays the public key string and date added
(If you already Generated key pair then no need to generate it again)

• This reply was modified 3 years, 6 months ago by Murali.

It is ok, i tested push notification after logging on to your website in frontend, it is working screenshot