unable to add user and permission

Hi @chandrika123 

The Permissions tab allows editing of CUG configurations based on the presence of the granite:AuthenticationRequired mixin. If page permissions are configured using deprecated CUG configurations, based on the presence of cq:cugEnabled property, a warning message will be shown under Authentication Requirement and the option will not be editable, nor will the Permissions be editable.

In such a case the CUG permissions must be edited in the  classic UI.

Thanks