Ask HN: Meta Integration Help

Hello community, does anyone here have experience developing integrations with Meta? I built a business app that I fully tested and works as expected. However, even though I’ve set it to live, when I try to authorize the app with an account not listed under "testers," I get the message, "This app isn't available." Could someone more experienced guide me on what I might be missing or doing wrong, or how to ensure my app is available to users beyond just the testers?