Genymotion Desktop is not compatible with complex proxy authentication schemes such as Active Directory NTLM or Kerberos.
As a workaround, you can use tools such as Cntlm or NtlmAps which provide a local and non-authenticated proxy that takes care of upstream proxy authentication for Genymotion Desktop.
Note
Please refer to Genymotion Desktop documentation if you need to use Genymotion behind a proxy.
If you wish to connect Genymotion virtual devices to a proxy, please refer to How to connect a virtual device to a proxy?