Subscribe to Apple One in a Mac OS Catalina

I am not sure, but since your 2012 is not compatible, I would assume that you may or may not be able to manage it on an incompatible device. Also remember that in order to subscribe, you need to use your own Apple ID on any device.

Best to check with Apple to make sure.

Hi gustavo786,

We understand you're trying to set up the Apple One service. We're happy to help.

You can set up Apple One here: Apple One

Just select the Try Apple One button at the center of the page.

We hope this helps. Take care!

Unfortunately, a mid 2012 MBP cannot be upgraded to Big Sur; your OS is the latest one it can handle. And, Apple One requires Big Sur or later:

Apple One services work across your Apple devices, including iPhone and

iPod touch with iOS 14 or later, iPad with iPadOS 14 or later, Apple TV

with tvOS 14 or later, and Mac with macOS Big Sur or later. If you

subscribe through another device, you can still enjoy Apple One on any

version of macOS earlier than macOS Big Sur. Apple Fitness+, included

with the Apple One Premier plan, requires Apple Watch Series 3 or later.