You can try the following two commands to locate the App(s) in question and firstly remove from all users, then secondly to remove the package from Windows.
Open an elevated PowerShell terminal and run:
Get-AppxPackage -AllUsers | Out-GridView -PassThru | ForEach-Object { Remove-AppxPackage -AllUsers -Package $_.PackageFullName -Verbose}
then run:
Get-AppxProvisionedPackage -Online | Out-GridView -PassThru | ForEach-Object { Remove-AppxProvisionedPackage -Online -PackageName $_.PackageName }