Assign Cloud Account Administrator Role

Once you created the user  using Identity - Federation - Create user.  You need to assign the roles to access the OCI resources . Follow the below steps to assign the "Cloud Account Administrator Role".

In the Create user section, we can see the created user. Click on the user, it will open the another window, where you can assign the roles. 

Click on Manage Roles

Select the check box to assign Cloud Account Administrator Role and click on Apply Role Setting