The Synchronization Method of Your Windows Phone And PC With Your Microsoft Account 

Resolve micro-soft account with the help of Windows Support. You can not neglect this error. It can become bigger issue else you must see what happen if the Microsoft account is suspended. https://windowtechnicalsupportblog.wordpress.com/2018/05/15/the-synchronization-method-of-your-windows-phone-and-pc-with-your-microsoft-account/