Invalid discovery document

Hi

We are integrating the OKTA Login in an Android App. The integration has been done successfully. When we are installing the App from Android Studio, the OKTA Login is working on the phone. When we are installing the app from signed APK or from Play store, it is giving the authorization error i.e. “Invalid discovery document”

What can be the issue, we have re-confirm the Application details and also tried by setting up a new application, but we are getting this issue.

Any thoughts on how to remove this issue.

Thanks