Unable to click "Generate" button in Firefly Audio/Voice Generation

Hello,

I am trying to use the new "Text to Audio" (Voice Generation) feature, but the "Generate" button remains disabled even after I enter the text.

Symptoms:

I have entered text in the prompt box, but the button stays greyed out.

I have tried changing the text, but it didn't help.

Is there a specific character limit, or a requirement to select a voice style/language before generating? Any advice would be appreciated.

Thank you.