Hy,
I have uploaded the app to App Store with both architecture. Please see the attached image for Build Settings of TARGETS in Archi
Build Settings
TARGETS
Archi
Check if you have 'Architecture Priority' LSArchitecturePriority in your Info.plist. I had Intel (32-bit) for some unknown reason. Deleting this key solved the issue for me.
LSArchitecturePriority
Intel (32-bit)