I am currently developing a iOS App for the App Store. I am not sure if you are familiar with PWAs (Progressive Web Apps), but it is still not possible in 2021 with iOS 14.5 to send Push Notifications to a PWA App on a iOS Device. This is really disappointing. My App is called PWA Push Handler. The Idea is that you as developer can register your PWA at my Service and then add a Banner to your PWA that the User should download the Push Handler App to the iPhone and add the PWA (also with deep links if the app is already installed). With a Post Command you can send Push to your PWA and the App will Receive the Push Notifications and on click will redirect to the PWA. Apple declined the App now multiple times because of the following Reason: Guideline 4.2 - Design - Minimum Functionality We found that the usefulness of your app is limited by the minimal amount of content or features it includes. Next Steps We encourage you to review your app concept and incorporate different content and features that are in compliance with the App Store Review Guidelines. We understand that there are no hard and fast rules to define useful or entertaining, but Apple and Apple customers expect apps to provide a really great user experience. Apps should provide valuable utility or entertainment, draw people in by offering compelling capabilities or content, or enable people to do something they couldn't do before or in a way they couldn't do it before. There you can see that Apple is not really wanting to have a possibility to send Push Notifications for Users. I tried to talk with the Developer Team there but the only answer i can get is the message above.

Same problem here. I am using Angular.