What i did was the app reset. Now its nowhere . Not in Cortana, Apps and Features, etc. I ran the troubleshooter from Microsoft. both inbuilt and the one downloaded from MS. And I can get this message " you need a new app to open this ms-windows-store. "
Is it completely gone? or can I reregister it ?
how can i reopen my apps that disappeared
I was facing the same problem (Microsoft Store and several other apps missing) and none of the methods described on various websites worked for me. Finally, I downloaded the media creation tool from https://www.microsoft.com/en-in/software-download/windows10 and reinstalled Windows 10.
That solved my problem.