[grace-baker Hexnode 15 December 2019 grace-baker Moderator]

Hey, Thanks for reaching out. Happy to help.

Please navigate to the Policies tab and create a new policy or you can choose to edit an existing policy. Please navigate to iOS–>Advanced restrictions–>Allow App Settings. The ‘iTunes radio’ option will be listed below ‘Allow App Settings’
Disable the option to prevent the app which allows you to listen to Internet Radio. This option is allowed by default. Note to associate targets and save the policy.

Please use the link for a reference to the Advanced  Restrictions.

Cheers!
Grace Baker
Hexnode MDM