Windows 10: Sign In Error - "We can't sign into your account"

I Just had a log in error. I have a Dell Precision 7710 mobile work station with the Anniversary Update. I turned on the machine and tried to log in and got:

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We can't sign into your account
This problem can often be fixed by signing out of your account, then signing back in. If you don't sign out now, any files that you create or changes that you make will be lost.
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Logging out and restarting did not work. I shut it down, undocked (it is a Thunderbolt Cable Dock), and then restarted. Luckily it was back to normal log in. I shut down docked, and booted and it was normal log in again.
Not sure what happened. Hope the issue does not come back.

I read online this happened to others, but cannot find a cause or fix (other than restarting) and wondering if anyone knows why this happened.

thanks

:)

 

Error message says "We can't sign nto your account" on a domain account. I've tried restarting, several times. The account is an administrative account.

Error message says "We can't sign into your account" on a domain account. I've tried restarting, several times. The account is an administrative account.

 

Cannot log in with password on Windows 10

After running a virus scan - could not log into computer with password - error message: "We can't sign into your account." This problem can often be fixed by signing out of your account and then signing back in. This DID NOT work. I changed password...
this DID NOT work. Any help is appreciated.

 

I cannot find out how to repair this error. I am almost ready to just reinstall windows any better suggestions?
Greg