IAP Extension, no valid SKUs

Hello everyone,
I have a problem with the IAP extension that is making me desperate.

Here is my setup:
I have used the tutorial on Github and the documentation on the Gamemaker site for everything.
I have created several Iap's in AppStoreConnect, all are in the status "Ready to submit" and also assigned to the app.
For testing I use my cell phone which I have connected via cable. I have transferred the app via Xcode and also use the console output there.

And now here is my problem.
When...

IAP Extension, no valid SKUs