Hi Team ,
Actually we are facing some issues while trying to integrate with Cuba Rest API
below is screen shot post man regarding trying to call Cuba oauth/token api


User is used to login as below

Although user is able to login as below

Exception while trying to call the oauth API from post man

User Already has permission to Call Rest API as per below

Is their is any thing that is missed ?
Although we tried to call the same from the code and we are getting sample of the request Entity

we are getting below exception

Please your urgent support for that case ?