ENDeveloperRegion
A string that specifies the region that the app supports.
Discussion
All ExposureNotification apps must specify the region for which they work by adding this key to the app’s Info.plist file. The value is a string that represents the app’s region. This value can be an ISO 3166-1 country code (e.g. “CA” for Canada), or the ISO 3166-1/3166-2 country code plus subdivision code (“US-CA” for California).