The Qello Concerts app is only available on PlayStation in certain locations, the app is NOT available in North America.
If your internet connection is strong, please try closing and opening the Qello Concerts app. You can do this by pressing the PlayStation button to access the live area screen. Press and hold the O button to close the app. Open the Qello Concerts app try the stream again.
If you're still having problems, please contact firstname.lastname@example.org