By "What devices on plan" do you mean you need to check on what devices you can use that plan?
If yes, please let us know the Adobe Plan you are checking, we will help you with the details.
I see that you have Adobe PDF Pack subscription.
For that, you can refer this help document: System requirements for Adobe PDF Pack service
You may also refer this document for more info: FAQ | Adobe PDF Pack
Let us know if you have any questions.