When the chat thread is open with FYI running in the background, the sender does not receive a double-check mark indicating that the message has been "delivered."
Workaround: If someone sends you a message while the FYI app is closed, upon opening the FYI app, the message will be marked as delivered for the sender. If another person sends a message, you can force close the app and reopen it, which will then show the message as delivered for the other person.
Devices Affected: iOS & Android