About a week ago I was in the dashboard and I received some sort of credit/free usage until some day in April, but I can’t see any trace of it to check which models it applied to.
At the bottom of this help page is more information about the program, and exactly where to look for it as a setting in your overall organization or in individual projects you select to ensure it is enabled and confirms your enrollment – if you are eligible.
You must deliberately choose the option to share prompt and response training data with OpenAI.