Converts Polar Flow TCX file for Garmin Connect

convert-polarflow-to-garmin.ps1

#
# Removes incorrect data from *.tcx files exported from the Polar Flow
# web site so they can be uploaded to the Garmin web site.
# More info: https://forums.garmin.com/showthread.php?165708-Polar-Flow-TCX-export-to-Garmin-Connect
#
$SourceDir = "C:\Users\Gianluca\OneDrive\Documents\Health\PolarFlow";
$DestinationDir = "C:\Users\Gianluca\OneDrive\Documents\Health\ExportGarmin";

Get-ChildItem $SourceDir -Include "*.tcx" -Recurse |
    Where-Object { !(Test-Path (Join-Path $DestinationDir $_.Name)) } |
    ForEach-Object {
        Write-Host "Processing $($_.Name)";
        [xml]$tcx = Get-Content $_.FullName;
        $node = $tcx.TrainingCenterDatabase.Author;
        if ($node -ne $null) { $node.ParentNode.RemoveChild($node) | Out-Null; };
        $node = $tcx.TrainingCenterDatabase.Activities.Activity.Creator;
        if ($node -ne $null) { $node.ParentNode.RemoveChild($node) | Out-Null; };
        $tcx.Save((Join-Path $DestinationDir $_.Name));
    };

I tried this just now, and Garmin Connect didn't accept the file. Any idea why?