A quick check usually fixes it.

Check the server address includes http:// or https:// and any required port. Re-enter the username and password exactly as your provider sent them. Confirm the account has not expired and that the provider allows another simultaneous connection.

Refresh the playlist, confirm the provider account is active, and try a different title or channel. If the whole library still fails, remove and add the playlist again.

EPG data comes from your provider. Force a guide refresh in Settings and confirm your provider supplies guide data for the affected channels.

Try another channel, switch between Wi-Fi and cellular, and test a lower-bitrate stream if your provider offers one. Buffering is usually caused by the network or stream source.

The stream may be offline at the provider. Wait for the timeout message, then try another channel. If other channels work, the issue is with that stream rather than PeekTv.

Choose Restore Purchases in PeekTv Settings and confirm the device is signed into the Apple ID used for the purchase.

Confirm both devices use the same Apple ID, iCloud Drive is enabled, and PeekTv is allowed to use iCloud. Keep the app open for a minute after making a change.