ZoomController sdk_authenticate getting exception

@chunsiong.zoom I upgraded my zoom sdk to latest version. For forming my JWT I followed the instructions given here:

Used the jwt in this code snippet →
AuthContext authContext;
authContext.jwt_token = “XXX”;
LOG_INFO(TAG)<<“Authenticating Zoom SDK”<<endl;
throwIfNotSuccess(authService->SDKAuth(authContext), LINE);

But in onAuthenticationReturn callback I am getting authResult as 5 (Unknown error). What can be possible reasons for this error ?