Found that the UIBackgroundModes Keys are being set by the Cordova StreamingMedia Plugin, which plays video on iOS and Android in Native mode.
I will be checking with Apple how to proceed.
Please consider this issue solved.
Thanks for your tip.
Best Regards Joni
Thanks for your fast repy. I will check the cordova plugins and let you know...
Setting the cordova-plugin-ionic-webview gives a build error ( see log attached)..