Hi @Anonymous ,
To you first issue, if the app is running, the parmeters actually don't be changed when clicking a notification with parameters to open the app. From my view, the parameters can only be passed at start of app, a little similar with OnStart. If you want to pass the parameters whenever you want, I suggest you submit an idea to PowerApps Ideas Forum. PowerApps product team would take it into consideration when designing the next version in the future.
To your second issue, I also made a test on my iOS phone, it can still receive the notification when I force closint the app. so for further test, could you share some details with your Flows? Are you the only one meet this issue? What about your colleagues?
Best regards
Sik
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