"Generate Image" always produces completely black results.

So I opened the PS Beta today, and gave the "Generate Image" (Assuming it's powered by Firefly) feature a try. Unfortunately it doesn't seem to work.

Prompt and settings:

Results:

This seems to happen no matter what prompt I feed it, what reference image I give it, or what style I have selected.

Does anyone know what's wrong here?

Would be great to get this feature working properly inside PS so I don't have to generate with firefly on the web.