I have a premium subscription but am any allowed shuffle play on two of my 3 devices

[osornios]

Hey @Stinastud,

Try logging into your Spotify profile on your browser here with your email. Your username will be displayed after you login.

After that, check the status of your subscription. If everything looks ok, logout of the app in your devices, and be sure to use that username, instead of your email address, to login to your account. It's the one with the Premium features.