Apple review rejected binary

I developed an app with ionic 4. Everything is good.
My app is deployed on Play Store but it’s rejected by Apple, reason : Guideline 2.2 - Performance - Beta Testing with a screenshot (blank page with toolbar and back button, content isn’t loading).
Content of this page is loaded by a WebService, to have this pas, user/robot is authenticated (so I suppose that network is OK).
I don’t reproduce this error in local or on 3 differents devices.

Have you already have this error ? Have you got an idea to resolve this ?