Hello
You setup the site correctly on Safari: https://spurt.no/
Safari only works on MacOS, not Windows or iOS.
Apple currently still does not support Web Push Notifications on iOS mobile devices like iPhones and iPads.
For more information, please read our Blog Post here: https://onesignal.com/blog/updated-ios-web-push-predictions/
Currently iPhones and iPads can only get notifications from mobile apps, not from websites.
For now, if you need push notification on iOS devices, you must create an actual iOS mobile app and not just a website.
If you need further assistance, feel free to email us at support@onesignal.com or chat with us in the documentation using the intercom button on the bottom right.
Thanks