littlepieces

Hi everyone, Just bought my first prime for my X-T4, the XF 23mm f2. However, autofocus doesn't seem to work? The autofocus square frame just sits in the top left corner of the scene no matter what's in the shot, it never moves, automatically locks onto, or hunts for subjects, I have to move it manually. Any idea why this might be? I've spent a lot of time Googling and can't find anything. I've never owned a prime lens before so maybe I'm being stupid. Thanks!