Huawei P8 lite does not ask for user name password for connecting to WI-FI
It won't prompt you, it must be setup manually in Android devices using Settings-WiFi and Add network, then enter the information manually. Enter the SSID manually, then change Security to 802.1x EAP, set EAP method to match your network (probably PEAP, ask your IT dept if unsure), then if 2 Phase authentication or CA certificate is required enter that information (otherwise leave blank), under Identity enter your username typically 'Domain\User' and the Password. 

If that doesn't work, you will likely need to contact your IT department for more guidance.