Proper Use of Add-PWUserstoConnectedProject?

Is there a particular way things need to be set up in order for this to work? We've begun the process of making our existing rich projects associated with connected projects.

Get-PWUser -UserName user | Add-PWUsersToConnectedProject -FolderPath "abc"

If I pipeline a user in I get this error:

The input object cannot be bound to any parameters for the
command either because the command does not take pipeline input or the input and its
properties do not match any of the parameters that take pipeline input

$user = get-PWUser -Username user
Add-PWUsersToConnectedProject -FolderPath "abc" -InputUsers $user

If I pass the user as a parameter I get this error:

Add-PWUsersToConnectedProject : Cannot bind parameter 'InputUsers'. Cannot convert the
"Bentley.ProjectWise.PowerShell.Common.User" value of type
"Bentley.ProjectWise.PowerShell.Common.User" to type
"Bentley.ProjectWise.PowerShell.Common.User"

What am I missing?