Facing Signature verification of push package failed issue in safari web push

We are integrating Safari Push notification on the website but we can not get permission pop-up in the safari browser.

We have followed the below documents and tried. but we didn't get success.

1. https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/NotificationProgrammingGuideForWebsites/Introduction/Introduction.html#//apple_ref/doc/uid/TP40013225-CH1-SW1
2. https://medium.com/@rossbulat/safari-push-notifications-complete-setup-ef57f19bbb89
3. https://medium.com/anantha-krishnan-k-g/safari-push-notifications-ec171bdf6ead

Using the above document we can get the pushPackage.zip file and extract that file also in our server. We have added log in our server there will get the error: "Signature verification of push package failed - Safari Push"

We can`t find a solution for the above issue. If anyone helps with this issue it will be very useful for me.

Thanks in advance!