iControl with Radius

I'm getting quite confused whether I can have an RBAC for iControl for BIG-IP 12.1.0 Build 2.0.1468 Hotfix HF2 with my F5's that are integrated with Radius for authentication.

The local admin accounts works perfectly fine but when I create a user using the following articles. None of them worked for me.

• Authentication with the F5 REST API
• iControl REST Fine-Grained Role-Based Access Control

I even tried to add an admin user using tmsh and still that wouldn't work.

Thanks!