The settings are within the normal text message app.
In the app you use to send/receive text messages, press the three dots at the top right, choose Settings, Chat Features, and turn off "Enable Chat Features" then turn it back on (it may take a few minutes to update)
Sorry again, I've found out the 3 dots were out of view at the top. I've done what you said and when enabled it's displayed the same number (not mine) that it did earlier today. My daughter called it and it plays a message saying calls aren't being connected.