New-SFTPSession fails on macOS with Windows Registry error

Platform is macOS 10.13.4 with PowerShell 6 and .NET Core 2.1

When trying to create an SFTP session:
New-SFTPSession -ComputerName $server -Credential $creds -AcceptKey -Verbose

An exception is thrown seeming to indicate this isn't compatible with macOS, as it's referencing the Windows Registry:

New-SFTPSession : The type initializer for 'Microsoft.Win32.Registry' threw an exception.
At line:1 char:2
+  New-SFTPSession -ComputerName redacted -Credenti ...
+  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : NotSpecified: (:) [New-SFTPSession], TypeInitializationException
+ FullyQualifiedErrorId : System.TypeInitializationException,SSH.NewSftpSession

$PSVersionTable                                               

Name                           Value                                                                                
----                           -----                                                                                
PSVersion                      6.0.2                                                                                
PSEdition                      Core                                                                                 
GitCommitId                    v6.0.2                                                                               
OS                             Darwin 17.5.0 Darwin Kernel Version 17.5.0: Mon Mar  5 22:24:32 PST 2018; root:xnu...
Platform                       Unix                                                                                 
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                              
PSRemotingProtocolVersion      2.3                                                                                  
SerializationVersion           1.1.0.1                                                                              
WSManStackVersion              3.0 

Start by reproducing the New-SFTPSession command on macOS with the reported PowerShell and .NET Core versions, then trace the session creation path that triggers the Microsoft.Win32.Registry exception. Done means the same SFTP session can be created on macOS without the Windows Registry error.