Having the same issue. Did you ever resolve it?

You can modify this slightly to handle iOS 18 https://stackoverflow.com/questions/76864560/is-there-a-way-to-provide-ios-version-check-inside-widget-extension/77082330#77082330

Yeah! Thanks, that was my problem also.

Did you figure out how to send the notification? I am a bit confused about the documentation. it does not say what to do with the token, how to encode it or send it to the push server.