I have a year subscription for Freedome on my Ipad and Iphone.
On my Mac it says that subscription is expired. Do I need an additional subscription for my Mac? Or how do I validate my subscription also for my Mac.?
Are you using an App store Freedome subscription? If yes, app store subscription can be used only on one operating system as long as all the devices have the same user account/Apple ID. However, multi device subscriptions can be used on different platforms.
This article has more information about your issue. To know more about the Freedome subscription options, this article can help.