Hi @Anonymous,
Which account you are using to login Windows 10, UAC enabled? Have you verified the Date and time settings? Make sure the time zone matches your region.
And as @AndyPennell, suggested, run wsreset.exe to clear the Windows Store cache to check first.
Type wsreset.exe in the search box and then press enter.
If this won't help, run the Windows Built-in Windows store App troubleshooter as step 2.
You can also open the troubleshooter through:
Settings->Update and Security->Troubleshooter->Windows Store Apps->Run the troubleshooter
If step 2 also fails, then open command prompt with admin rights, copy and paste the following:
PowerShell -ExecutionPolicy Unrestricted -Command "& {$manifest = (Get-AppxPackage Microsoft.WindowsStore).InstallLocation + '\AppxManifest.xml' ; Add-AppxPackage -DisableDevelopmentMode -Register $manifest}"
Press enter.
After that, check to see if it would work.
If issue still insists, please post back.
Regards,
Michael