We have a customer in Korea who has an issue enrolling its devices with the Android Management API.
The download link of the Device Policy APK returns an HTTP 500 error. The customer tried loading this link on his browser through a WiFi network and got the same error. He also tried loading it on his smartphone from a 3G network and also got the same error.
On my side (from France), I can download the APK without any problem.
Are you aware of any network issue accessing the Play Store from Seoul, Korea?
BTW, the Korean message on the screenshot states: There was an error. Please try again later. That's all we know. :)
Florian
Update (2019-04-16): The Android Management API is now available in Korea.
As of today (2019-02-12) the Android Management API is not available in Korea. We are working on making it available.
As a consequence it's currently not possible to set up devices in Korea (IP based), however devices set up outside of Korea can then be used in Korea without issues.