I am developing a react-native Android application that uses the latest version of react-native-ibm-mobilefirst library (8.0.2020022509). Currently, I encountered the issue stated in the title whenever my mobile app executes the following statement 'WLAuthorizationManager.obtainAccessToken(Scope)'. My MobileFirst server (8.0.0.00-20200211-1526) is located behind a reverse proxy (iis) which I notice the request seems to be redirected to an unknown URL because https://mfpredirecturi does not exist. As a result, my mobile app received a '403 - Forbidden: Access is denied' response.
The following GET request was sent from the mobile app where the redirect_uri is: https://mfpredirecturi
The strange thing is I notice my other application that uses the ibm-mfp-web-sdk sent the same request except for redirect_uri parameter and has no issue at all: