Whatsapp Cloud Api Interactive Reply Button Response Missing Data

I am sending an Interactive reply buttons message using the Whatsapp Business API. I define the body text and two Quick reply buttons, supplying each button with ID and title. This message sends fine as the receiver sees the message and the two buttons, however when they click on either button and send the quick reply, the notification I get back on my server is a nearly empty payload:

{"Type":"interactive","From":"redacted","Id":"wamid.redacted","Text":null,"Sticker":null,"Referral":null}

This is missing the interactive object which should say which button was pressed.

I have tested the exact same code on my test number and it works as expected (I get a response which contains the interactive object). It is just on my live business number where it does not work.

Because it works with the test number and not my live number, it feels like something needs approval. The only mechanism I can see for approval is Message Templates, so I created a message template with the exact same body and buttons that I am sending, however this did not work.

Anyone got any ideas?

Cheers