WS1 UEM .NET Globalization settings
Usually, on-prem installation of WS1 UEM is doing with localized Windows servers (French, Russian, as an examples). With that, default settings in IIS can be set up incorrectly. This issue may prevent enrolling Windows devices (iOS or Android devices enroll well at the same time).
To fix this isseu you need to change .NET Globalization settings for Default Website level for all DS servers in your environment:
|Culture||English (United States) (en-US)|
|UI Culture||English (United States) (en-US)|