After you get a notification, it may take some time before you receive the actual message.
If you're still having trouble, please try the following:
• Go back to the list of chats and then reopen the chat room you're having issues with.
• Restart your device.
• Update the LINE app here.
• Check or disable any web limiting or filtering services you may have in place.
Note: Consult your mobile phone carrier for more information about web limiting and filtering services.