IOS App Whitelabeling: Runs in Simulator, crashes after Splashscreen on iPhone


I’m pretty new in XCode and I want to Whitelabel the RC apps, as a first step for IOS. I followed the docs for whitelabeling, all runs well and the app works fine in the Simulator on my Dev VM using MacOS Catalina.

One I archive the build for an internal Testflight release and load it on my physical iPhone, the app crashes to the Springboard after showing the Splashscreen for about a second.

Did anyone experience the same? I’m using XCode 12.0.1.

Thanks for any suggestions!