I am getting the same issue. Rejected for App Completeness because app is loading (fetching data from Firebase which is ~200kb) takes forever. Firebase storage without even auth needed. Literally, anyone can access firebase storage data (Another security thing but not the point).
The point is that every testflight tester within/outside Australia (Even ones in the US) are getting the data just fine, whilst only the apple team gets a problem with their network.
It does not even crash, so no logs are being detected on our analytics. It's hard to reproduce as well if only Apple testers are getting this problem whilst the rest of the world are fine.
I am really stuck here as I have sent them videos showing that it works.
themobilecoder
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Mine is australia-southeast1 and it does not work for apple reviewers. So apple network does not connect to firebase storage outside US? Can anyone confirm using firebase servers within the US?