Apple TV remote keyboard not showing up

Hi all,

I'm having a problem using my iPhone to enter information on my Apple TV.

Whenever I have to type something on my Apple TV, I get the notification on my phone.

I tap the notification and the Remote app launches just fine and a text entry box appears.

The problem is that no keyboard comes up so there's no way for me to type. Here's a screenshot.

If I tap the keyboard icon at the bottom, the text box disappears. I tested with my iPad and the keyboard shows up fine there but not on my iPhone. Any advice? Thanks, Claire