I have two Windows 10 laptops. One is a work laptop and one is my personal laptop. I work from home and both laptops are connected to the same network at my house. From time to time I need to access files on my work laptop from my personal laptop, so I've tried to connect to the administrative file share on my work laptop using \COMPUTERNAME\c$ but no matter what credentials I use, I get "The user name or password is incorrect." This has nothing to do with the administrative share; the same thing happens when I simply try to connect to the computer using \COMPUTERNAME.
I log into my personal laptop with my personal Microsoft account. I log into my work laptop with my company email address, and I can also log in using DOMAIN\USERNAME. Windows Settings on my work laptop shows it is connected to my company's Azure AD, but it is not joined to the domain. (It is a member of WORKGROUP.) Local Users and Groups does not show my user account listed as a local account, but it is listed as a member of the local Administrators group as DOMAIN\USERNAME. I am able to VPN to my company network as needed, but most of the time I do not use the VPN. My work laptop has never been physically connected to my company network. (I work from home in a different state.)
How do I access file shares on my work laptop from my personal laptop? When I try to connect using \COMPUTERNAME I am prompted for credentials. No matter what I use, I get the error "The user name or password is incorrect." I've tried all of the following:
username@keyman .com
DOMAIN\USERNAME
domain.com\username
MicrosoftAccount\username@keyman .com
PCNAME\USERNAME
.\USERNAME
I've verified that I can log on locally to my work laptop with username@keyman .com or DOMAIN\USERNAME, so I know I'm using the correct password. I've also verified that my account is not duplicated in Azure AD and I am not locked out. I am not trying to connect to anything on premises. This is a connection between two laptops on a private network using Azure AD.