Unable to view all devices

[JoshMogan]

Plan

Premium

Country

UK

My Question or Issue

When using Get Available Devices endpoint using the following command: 

curl -X "GET" "https://api.spotify.com/v1/me/player/devices" -H "Accept: application/json" -H "Content-Type: application/json" -H "Authorization: Bearer <myToken>

With the required scope:

user-read-playback-state

I will only be able to see a few devices. Web Player and my phone when connected. However, I expect to see more devices on my network. Mostly chromes casts or google speakers. 

In the Andriod app, I can see all of these. Why do these not appear when hitting the endpoint?