Import-Module IISAdministration Fails With "Could not load file or assembly 'Microsoft.Web.Administration..."

[tparikka]

Steps to reproduce

On Windows, run the following script in PowerShell 7.2.1:

Install-Module -Name IISAdministration
Import-Module IISAdministration
Get-Module -ListAvailable

Expected behavior

The import should succeed and the module should be listed:

Script     1.1.0.0               IISAdministration                   Core,Desk {Get-IISServerManager, Set-IISConfigAtt…

Actual behavior

The import fails with the following error:

Import-Module: Could not load file or assembly 'Microsoft.Web.Administration, Version=7.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

The system cannot find the file specified.

The Get-Module list shows no cmdlets associated with IISAdministration:

Script     1.1.0.0               IISAdministration                   Core,Desk

Environment data

On the machine exhibiting the problem behavior:

PS C:\Users\thoma> $PSVersiontable

Name                           Value
----                           -----
PSVersion                      7.2.1
PSEdition                      Core
GitCommitId                    7.2.1
OS                             Microsoft Windows 10.0.19044
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

On the machine working successfully:

PS C:\Users\thomas.parikkaADM> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.2.1
PSEdition                      Core
GitCommitId                    7.2.1
OS                             Microsoft Windows 10.0.19042
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

I have confirmed on a VM running 19042 that the Windows 10 build is not a factor as far as I can tell, because on a 20H2 VM I still see the problem behavior. I have also enabled IIS Management Console and IIS Management Scripts and Tools. The bulk of the documentation I could find referred to earlier versions of PowerShell 7 not supporting IISAdministration, but this doesn't seem to apply to 7.2.1 - if it did globally, I wouldn't have myself and multiple other team members running the scripts with no issues. I appreciate any help!