Hi, ellis.r03, and thanks for reaching out. We see you're having trouble seeing your Beats on your iCloud account. We'll be glad to provide some info.
We see you came here from If your Powerbeats Pro, Beats Studio Buds, or Beats Fit Pro are lost
Per Set up Find My on all your devices , " Set up your AirPods or Beats headphones
If you pair your AirPods or Beats headphones with your iPhone, iPad, or iPod touch, they show up in your Devices list in the Find My app. You can use Find My to locate or play a sound on them. If your AirPods support the Find My network, you can also mark them as lost.
For more information, see any of the following:
So they should be connected as long as you're signed in on your devices. We'd like to clarify this is just for the Find My feature though. Are you attempting to link them in some other way?
Cheers!