Hi Leo,
This can be happen with a error with the comunication with the microsoft store, its can be possible with a internet connection or corruption of some files from the image, please like first instance check if your time or the computer is correct and if you are able to navigate into internet.
After this please check runing the powershell commands to try to register the Microsoft Store: (Remember Run as administrator)
Command 1:
powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\WinStore\AppxManifest.XML
if that command doesnt work try with the second one:
Get-AppXPackage -AllUsers -Name Microsoft.WindowsStore | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" -Verbose}
Please check it and let us know if this help you with the resolution!
If this is not a solution for you, please go to the eventviewer and take a screen shot of the error events related with the Microsoft store to take a look and check it!.
Best regards!