If you want to add the VC permession to the User, then you should have atleast one user which can login to virtual center.Please see the steps as below.
Through vSphere client:
- Login to vcenter using the user ( which has VC permession to login )
- Go to Permession-->Right click on the page-->Select Add permession--->click Add Button
- You will get a drop down box called domain-->Selcet the domain where you have the user-->seach the user name in seacrch box-->Add the user-->then
OK
-In right side of Add permession window, we have some role, you can select as you want-->then click on ok button
Through vSphere client:
- Login to NGC client ( which user has VC permession to login )
- Select the vcenter-->Manage-->Permession-->click on plus(+) button-->Add-->Select Domain where you have the user-->Add the user-->click ok
- In right side of Add permession window, we have some role, you can select as you want-->then click on ok button
Now this user has VC permession as well.If you should able to login VC server with user.You can manger both VC server and SSO with this user through NGC client.
Please let me know if you have any other issues.