Hi,

I'm experiencing an issue with the Login with FB feature in the WhatsApp embedded sign-up process, which works fine in my prod app (in both development and live modes), but it’s not working in my test app. Every time I try to use it with the test app, I get an error saying: "Feature Unavailable: This feature is not available at this time." See attached screenshot.

I understand that some features may not be available in test apps by default, but I'd like to know if there's a way to enable this feature specifically for test apps or if it is intentionally restricted? Has anyone else encountered this issue or found a workaround?

There seems to be a related post here - https://developers.facebook.com/community/threads/158090193008159/ but not clear what the "FBM Application List" is and how we can add our app id to that list?

Any insights would be greatly appreciated, thanks!