Beats studio pro not showing up on my apple account device list

I recently got a pair of beats studio pro's and as I just separately got AppleCare+ for them, I noticed that they are not associated or show up under my devices list in my Apple account. Is there some way to add them to my devices list so they're associated with my account? I do not find any options to add devices to my account.

I'm worried because I bought AppleCare now, but I'm wondering if I ever need to take them in for a repair, will apple need them to be associated somehow to my account? I've bought the AppleCare under my Apple account and connected them fully to my iPhone, but they still do not show up in my devices list under in my iCloud account. What does apple usually require for the AppleCare service? Is it enough for the beats to be simply covered under the serial number?

Thanks in advance for any help!