Private/Profiles/Save-LastUsedAccount.ps1

function Save-LastUsedAccount {
    <#
    .SYNOPSIS
        [PLANNED FEATURE] Saves the current account information to local storage.
     
    .DESCRIPTION
        This feature is planned for a future release and is not currently implemented.
        When implemented, it will store the User Principal Name (UPN) of the current account
        to a local file for future reference.
     
    .PARAMETER UserPrincipalName
        The User Principal Name (UPN) to save.
     
    .EXAMPLE
        Save-LastUsedAccount -UserPrincipalName "user@contoso.com"
        Will save the specified UPN when this feature is implemented.
     
    .NOTES
        Status: Not Implemented
        Planned Version: 3.0.0
    #>

    [CmdletBinding()]
    param(
        [Parameter(Mandatory, ValueFromPipeline)]
        [ValidateNotNullOrEmpty()]
        [string]$UserPrincipalName
    )
    
    Write-Warning "Profile management is not yet implemented. This feature is planned for version 3.0.0."
    Write-Verbose "Save-LastUsedAccount placeholder called for: $UserPrincipalName"
    
    # No-op for now
}