Docker on Windows Failed to start

 All of a sudden, my docker on windows stopped working with an error  unexpected error occurred: Logon failure: the user has not been granted the requested logon type at this computer. (0x80070569).

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I did couple of attempts and the error repeated. 

Finally followed this page and restarted the below services made the trick.

https://github.com/docker/for-win/issues/3542

Services restarted in services.msc:

1. Hyper-V Host Service

2. Windows Management Instrumentation Service.