Hi @karthikeayan;
Since you mentioned you "1.Created client" - is this the ARA client and has been configured to reflected in the customer.config?
When you create the user, are you doing it within the AE (thick client) or within the ARA AWI (logged in to the ARA client)?
As the user you are logged in with, to create the new user. Is that an ARA user & does that user have the ability to see the "Release Automation" perspective within that SAME client as that new user?
Also when you edit that user, do you see both the "Automation Engine" and the "Release Automation" tab for the permission?
(Notes: This screenshot is base on the ARAv7)

Normally, if you want to create an new ARA user. You would log into the ARA client (via the AWI) then as an ARA admin user (or equivalent permission to create new user) create the new user and edit that user.
Now, if both you (an ARA admin user) and that new user on that "specific" client and you both cannot see the release automation perspective then it would suggest some sort of configuration issue on the system.