I have noticed this stopped working recently. I think iOS 18. My solution is to provide a link that the app can handle and then to create a small landing page in case the user is not redirected.

I think Frazil is trying to diagnose an issue in their app via the Apple-provided reports in the Organizer window, but is getting an error ("Please provide a valid value."). I have been having the same issue: https://forums.developer.apple.com/forums/thread/767331

Thank you Ed. I have submitted FB15661357.

Yes, window.open is still working for me (iOS 15 and 15.0.1)

I had looked in to changing the icon via the background page but never fully implemented it. In beta 4 I am seeing the icons being white in dark mode and black in light mode so I think they've fixed this. The only question remaining is what the image sizes should be. Creating a feedback is a good idea!

You can file feedback via the Feedback app: https://developer.apple.com/bug-reporting/

Thanks, this seems like the right way! window.location.assign("customURLscheme") was not working, I can't believe I didn't try this 🤦‍♂️