Hello, thanks for sharing this review!
Unfortunately, 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.
However safari on MacOS should work! Details on Safari Setup
As this is not a OneSignal issue, if this was the reason for a 4 star we hope this information helps reconsider the rating.
We greatly appreciate you sharing your experience and feel free to reach out to our support team at [email protected] or through our documentation anytime (intercom button bottom right corner): https://documentation.onesignal.com/docs/web-push-wordpress-faq
Thanks!