On-Demand Resources fails during App Review

Hello everyone,

we are trying to submit our iOS app for pre-order, which requires the app to be reviewed by Apple. Unfortunately, it keeps failing when accessing On-Demand Resources that need to be downloaded before the app starts. We are aware that ODR is not designed for pre-start downloads, but that's how we're using them right now. So please refrain from asking if we understood how to utilize On-Demand Resources.

App Review is seeing the following error (screenshot):

We are unable to reproduce this error. The download of required resources works fine for all of our devices, as well as for some external testers. They all used a normal Wifi connection.

Does anyone know if there is something special in the review environment? For example, do they use physical or virtual devices, a VPN or normal Wifi or a (maybe simulated) cellular connection?

We had no luck on any documentation about the error "MZCommerce.NoProductInStoreFront". Does someone happen to know what kind of problem is usually connected to MZCommerce errors when it comes to On-Demand Resources?

Thanks for your help!