Hi! I hope I selected the right part of the forum for this question. If not, feel free to tell me where to go, both literally and figuratively

I am a sprout playing on PlayStation, & I want to connect a keyboard for chat, as 'typing' on a controller is cumbersome at best.

When I plug the USB into the PlayStation, it is recognized immediately on the PS dashboard, however, when I get into the game it does nothing. There is an option to play with mouse & keyboard, but never having been a PC gamer I want to use the controller for gameplay. I just want the keyboard for chat, so I can say "Hi, I'm new..." in dungeons etc...is there a way to do this?
My searches online have suggested it should 'just work', but not for me.

Any help much appreciated.

Thanks!