Hi Vaibhav,
You can take the user name for whom it is not working and go to tcode SU01D.
Here you can check the roles assigned to the user, then take which role the user is using and facing the issue.
Then click on display or double click on role.After role page open you can see a tab for authorizations and there is a icon DIsplay Authorization data click on it..After this you can see all the authorizations assigned to this role.
Go to Utilities from menu and click on Technical names On. Here you can see all the authrization with tecnical names as like in SU21 tcode.
Just findout whether auth object has been assigned or not.
Best Regards,
Dharmakasi.