Apple TV+
I received an email saying I was to receive 1-year free of Apple TV , but I am unable to locate this offer when trying to subscribe...
Mac Pro
See Redeem your free year of Apple TV+ - Apple Support
You would redeem on your new device, running the latest version OS. Once it is activated, you can view Apple TV+ content on any of your devices with the Apple TV app and your Apple ID.
If the offer doesn’t present itself as described on that page, then contact Apple Support for assistance.