How do I enable/disable Digital Touch messages to expire after 2 minutes?

My partner and I have the iPhone 6 Plus and we updated to iOS 10 today. My phone seems to be working correctly with Digital Touch but his does not.

When I receive a Digital Touch message, the phrase "expires in 2 min" appears underneath the message on the right side. Shortly after, that phrase disappears to be replaced by "keep". If I press "keep", the message will not disappear in 2 minutes. Similarly, if I send a Digital Touch message, the word "keep" appears underneath the message (on the right side), and if I don't press "keep", the message will disappear.

However, this does not happen on his phone. When he recieves a Digital Touch message, no phrase appears under the message. The messages that he sends and receives never disappear. Also, instantly when he views the message, on my phone the phrase "kept" (along with the current time) appears underneath the message on the LEFT side of the message. I get notified that he has kept my Digital Touch message every time I send one to him but if I keep one of his, he is not notified.

All of our message settings are the same under Settings > Messages. For both of our phones I have turned on/off iMessage under Settings > Messages several times. I have restarted the Messages app several times. I have also restarted the phone by holding down the Home + Power button.

All the other features work for him including stickers and Bubble/Screen Effects, but I just can't seem to find where to turn on/off the 2 minute expiration for Digital Touch. Any help is appreciated!

(On a side note, we both have audio messages set to expire in 2 minutes and that feature works correclty for both of us.)