They’re simply your sign-in details (username + password) for another computer or server on your local network. Windows 11 often expects you to use the target device’s local account credentials, not your Microsoft account.
Trying to share folders or access a printer on your local network, only to be blocked by an "Enter Network Credentials" pop-up, can be incredibly frustrating—especially when you’re sure you’ve entered the right password. network credentials windows 11
When connecting to a machine using a Microsoft Account, modify the username syntax during login: They’re simply your sign-in details (username + password)