Hi Mohammad,
We are aware that there are customers experiencing issues with Windows RT/8.1 devices connecting to their Microsoft accounts. Our engineers are currently working to resolve the issue as soon as possible.
In the meantime, please continue to use your local Windows login account for the time being. You may try to reattach your Microsoft account as a connected account at a later time.
We appreciate your understanding. Feel free to post back if you need further assistance.
Regards.
Mod Edit: Marking as answered to raise visibility.
(Update 10/11/17) A change was implemented on 10/10 that should resolve this issue.