Proper Permission need to be assigned, follow the below steps to assign the permission.

1.   Login into your Project Web Access Site using your browser.
2.   Click on Server Settings.
3.   Select Security and click on Manage Users
3.   Click on the user on which user permission need to be modified.
4.   Select the list of Permission to assign the resource to see the Projects.

NOTE:  You would need to add the users in the control panel first at  Also, if this is the first time you are assigning permission to the specific user then you will need the SAM Account name; which is available under user details section in the Web Panel.