custom oauth2 sso implementation: facing issue while authenticating the client from the identity server

hi team, now, I have reached a stage wherein I have been able to follow the link ( Now, the click of a button is taking to my custom identity server page but it gives an error saying 'The client application is not known or is not authorized.' The identity server is implemented using and it works for all the .net client apps. So, am not sure if the problem is will java app calling based identity server. Technically, it shouldn't be the case as its just about providing the required credentials and then getting the client authenticated. Need help here please. what could I be missing ??
1 answers

Could it be that your identity server works against a whitelist and you haven't included/registered your app on it?