Unable to Install Docker using PowerShell 7 (P.3)

Trying to install Docker inside WIndows Server 2019 fails. It does not appear to be possible to install the latest version of Docker using PWSH 7 (P3).

Steps to reproduce

Install-Module -Name  WindowsCompatibility -Force
$IHT1 = @{
  Name       ='DockerMSFTProvider'
  Repository = 'PSGallery'
  Force      = $True
}
Install-Module @IHT1
$IHT2 = @{
  Name         = 'Docker' 
  ProviderName = 'DockerMSFTProvider'
  Force        = $True
}
Install-Package @IHT2

Expected behavior

This should have installed Docker - and it works in PWSH 5.x

Actual behaviour

PS C:\Foo> $IHT2 = @{
                   Name         = 'Docker'
                   ProviderName = 'DockerMSFTProvider'
                  Force        = $True
           }
PS C:\Foo> Install-Package @IHT2
Install-Package : The term 'Get-WindowsFeature' is not recognized as the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:6 char:1
+ Install-Package @IHT2
+ ~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (Microsoft.PowerShel…lets.InstallPackage:InstallPackage) [Install-Package], Exception
+ FullyQualifiedErrorId : FailedToDownload,Install-Package,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPackage
 

This is kind of weird since Get-WindowsFeature is available. I’ve loaded the module using Import-WinModule.

Environment data

> docker info
docker : The term 'docker' is not recognized as the name of a cmdlet, function, script file, or operable program.

Of course, since docker did not get installed, the above result is to be expected.

PS C:\Foo> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.0.0-preview.3
PSEdition                      Core
GitCommitId                    7.0.0-preview.3
OS                             Microsoft Windows 10.0.17763
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0, 5.0, 5.1.10032.0, 6.0.0, 6.1.0, 6.2.0, 7.0.0-preview.3}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

[doctordns]

Using RC1, this now works OK:

S C:\Foo> $IHT1 = @{
>>   Name       ='DockerMSFTProvider'
>>   Repository = 'PSGallery'
>>   Force      = $True
>> }
PS C:\Foo> Install-Module @IHT1
PS C:\Foo> $IHT2 = @{
>>   Name         = 'Docker'
>>   ProviderName = 'DockerMSFTProvider'
>>   Force        = $True
>> }
PS C:\Foo> Install-Package @IHT2
WARNING: A restart is required to enable the containers feature. Please restart your machine.

Name          Version          Source           Summary
----          -------          ------           -------
Docker        19.03.5          DockerDefault    Contains Docker EE for use with Windows Server.

[doctordns]

In trying to install Docker, I explicitly use Import-WinModule to “import” the Server Manager module, thus Get-WindowsFeature should work - but it doesn’t. I am not a great debugger so can not quite work out why this is happening.