OAuth Login Not Working

I know the OAuth is set up correctly because I’m using it in another app (paid) and it works perfectly. However when trying on a new app (free version), I’m getting the error: “The application is on a plan that does not grant access to its live version” which is not allowing me to complete the OAuth flow.

Do you need to be on a paid plan to test out OAuth logins? Or am I missing something?

Thank you!