Aug 08, 2019 10:41 AM|PatriceSc|LINK
Seems weird though it might perhaps happen if AD is locked down?
Not directly related but you have https://docs.microsoft.com/en-us/dotnet/api/system.directoryservices.accountmanagement?view=netframework-4.8 since
4.0 which can make using AD simpler.
I would do a last check(which server is providing the info and does it happen for all users ?) and would ask my AD admin. BTW see also on which account is running your app maybe.