R12 Error: Application Diagnostics is not a valid responsibility for the current user. Please contact your System Administrator.

User Must have one of the below roles to be assigned to run Oracle Diagnostics.

• Diagnostics Super user
• Application Super user
• Application End User

To Assign role:

1. Login to E-Business Suite as System Administrator
2. Select the "User Management" responsibility
3. Click 'Users' in the right hand side menu
4. Enter 'User Name' and click 'Go'
5. Click 'Update' on the correct user
6. Click 'Assign Roles' button
7. Enter role name (or partial with %) you want to assign. You can enter any of the seeded roles (Diagnostics Super User Role, Application Super User Role, Application End User Role), or your own one
8. Check the box next to the appropriate role and click 'Select'
9. Enter 'Justification' and click 'Save'

Now ask the user to logoff and login again to  E-Business Suite and try again to access Oracle Diagnostics.