Generative fill: I have plenty of credits, but can't use premium features

I've got the most recent version of PS beta (27.2.0), and I have a lot of premium features credits, but I can't use any of them. If I select one of the premium models, the 'generate' button greys out. Logging out of and back into Creative Cloud, restarting the app, restarting the computer ... all of this does no good. Still disabled. Is there something I'm missing here? Screencaps show the credits and the greyed-out Nano Banana model.