Text message needs to be enabled??

I have been trying to reply to text messages from my husband and daughter this morning and get a message that says “text needs to be enabled”. If I go out of the reply and send the response as if it was a new text message, it goes through. What is the problem? Nothing has changed with any of our phones or service. We text all the time. I turned Phone off and back on and could reply to husband, but then daughter sent text and same problem happened with her.