Can't edit Dialogue for NPC

I was in creative mode with operator permissions and I spawned an npc using commands then pressed Edit > Edit Dialog, and got the rectangular box with the name of the npc at the top with the text “Type Dialogue Here…” below. However when I tap on that, my phone’s keyboard doesn’t appear and I cannot type anything in there.

I can change the name and appearance of the npc as well as the advanced settings, but I just can’t edit the dialogue