Hi @Shivam Kumar​ ,

Thank you for writing to us,

Please follow the below steps to get your device name:

>If you do not know your device name

1. Open a command prompt
2. Enter "whoami".

 Then, your device name will be output as result. 

• If the user name is part of your company’s domain, use the format “domain \ username”.   (This is your device name, not your email address.)

>Next, please enter the password when you use to log in to your device (PC) usually.