Hi,
I can understand that you are facing an issue while masking data. In that case, I would check the following:
* The user I login to is not a global administrator or admin user since the restrictions do not apply to them.
* The masking expressions for the sensitive fields are set properly.
For more details refer to the [Fine-Grained Privileges at View Level](https://community.denodo.com/docs/html/browse/latest/en/vdp/administration/databases_users_and_access_rights_in_virtual_dataport/fine_grain_view_privileges/fine_grain_view_privileges#row-restrictions) and [Modifying and Deleting Users](https://community.denodo.com/docs/html/browse/latest/en/vdp/administration/databases_users_and_access_rights_in_virtual_dataport/administration_of_databases_users_roles_and_their_access_rights/modifying_and_deleting_users) section of the Virtual DataPort Administration Guide.
Hope this helps!