I have tried to send a message with the in app messaging function. I wrote the message and sent it. After that, I see a notification below my message that the app tries to send it. After a while though, the app notifies me below the message that it could not been sent. There is also an advice to tap on it (what exactly?) to try again sending the message. But I can tap on the whole screen and nothing happens.
Now I have two messages which are stuck in the in app messaging. What can I do?