Set-RDMSession.method not working but Set-RDMSessionProperty does

I was trying to change all of my RDP sessions in powershell

I tried


$Sessions = Get-RDMSession | where {$_.Kind -eq "RDPConfigured"}
foreach ($session in $Sessions)
{$session.AutoReconnection = 'False'

Set-RDMSession $session -refresh}

It completes without error however does not set the value to false.
If the value is already false, it changes it to true

I eventually discovered I could set it with this command instead

set-rdmsessionproperty -id $session.id -property AutoReconnection -Value False

Why use set-rdmsessionproperty over assigning them direct with $session.Attribute