i found this:
Question: “Generative Fill” and “Generative Expansion” do not work for me. Is it possible to somehow solve this issue?
Answer: After beta testing of Firefly AI ended, Adobe developers decided to tighten the screws. Currently, only people who have actually paid for a subscription can use generative tools. And even then, they have restrictions on the number of generations. Also, generative tools can be used during a free trial period of 7 days. That is, if you really need generative tools, then register a new ID on the Adobe website and log in to the program using the Help->Sign In menu. After 7 days, register a new ID. And so on until you get tired of it. Unfortunately, there are no other ways at the moment.