In some cases, it may occur that your visitors reject the custom opt-in and browser notification.
There are two scenarios
A visitor can reject the first push notification opt-in.
A visistor can accept the opt-in and block the browser notification.
For the first scenario the visitor is still able to accept the opt-in by refreshing the page or on his next visit to the website.
In case the second scenario occurs and the visitor blocked push notifications and still changes his mind and want to accept push notifications, the best way to fix this problem is to clear his browser cache. If he decides to clear his cache do the following; 1. Open up your browser 2. Go to settings 3. Find the setting to clear the browser data/history.