An empty channel list after logging in is usually one of a few specific causes.
Give it time on first login
The very first load can take up to a minute or two, particularly on a large channel list — wait before assuming something is wrong.
Re-check your login details
A subtle typo in the username, password or server URL can cause an empty list rather than an outright error in some apps. Compare carefully against your original order message.
Confirm your subscription is still active
Since plans don’t auto-renew, an expired subscription will also result in no channels loading.
Try refreshing or re-adding the playlist
Most apps have a refresh option, or you can remove and re-add the playlist/user from scratch.
Still nothing?
Contact support with your device and app name so they can check the account directly.