Win10 boot prompt "Your device is offline" How to solve

When the computer is turned on, it appears "Your device is offline, please use the password used to log in on this device last time", and password login Invalid, what is going on? How to solve it?

Cause analysis:
It should be when you shut down before, you are using a Microsoft account that requires network authentication to log in. Now it is just not connected, so Prompt you to verify with the password you used before.
Workaround:
Networking Login with Microsoft account password.
In addition, if you are a broadband link user and have forgotten the previous password, it is recommended to log in on the Internet with a router.