Generative Expand not expanding

Hi Team

Long time learner, first time poster for help.

I was having a play with generative fill in photoshop (which was working), but when I tried generative expand with the crop tool like the tutorial, it came up with an error message saying "the parameters for command "Generative Fill" are not currently valid".  I have updated, restarted the programme, reset preferences, restarted my computer, but still no luck.  Has anybody encountered this and know of a solution?  The only thing I can think of is that I am a teacher and am using a school Adobe account.  But it will still let me use generative fill so I am not sure why it does one but not the other.  Am I missing something glaringly obvious?

Any thoughts will be greatly appreciated.