PowerShell associative array cannot be returned as function return value

I'm creating a GUI that does a lot of things with PowerShell.
Because there are a number of processes that require associative arrays, the function for creating associative arrays is once sandwiched and returned as a return value.However, we are at a standstill when we return it as a return value.
The following is a brief description of only the relevant code.

#Associative Array Creation
Function makeHashTable{
    Param(
        param1,
        param2
    )
    $HashTable=[System.Collections.General.Dictionary [String, PSObject]]:new()
    for ($i by index number) {
        $value=@()
        foreach($vin$values){
            $str = Abbreviated
            $value+=$str
        }
        $HashTable.Add ($List[$i], $value)
    }
    # １
    return$HashTable
}

# Button 2 Processing
Function Calc {
    Param(
        $HashTable
    )
    # ３
    $HashTable Processing
}

approximately
# ASSOCIATIVE ARRAYING BUTTON
$Button1 = Abbreviated
$Button1.Add_Click({makeHashTable param1param2})

# button for passing associative array
$Button2 = Abbreviated
$Button2.Add_Click({Calc$HashTable})#2

When you click button 1, an associative array is created, and when you click button 2, the associative array is used for processing.
What I tried was to call the associative array by adding Write-Host to parts 1, 2, and 3 to see if it would run without any problems (for 3, I rewritten Calc$HashTable to Write-Host$HashTable).
The result is
An associative array is created for
1. No associative array was created for 2 ($HashTable.Count is 0)
Same as
2 for 3 Yes,
I wonder why the return value of makeHashTable has not been returned from the above.
Also, how should it be corrected?
Thank you for your advice.