Hi Rinku,
did you assign the user in question to the project? Do this with the global admin user inside the ServerManager by opening the project properties:
It is not enough to have the users inside the FirstSpirit server by LDAP but also assigned to a project.
Then you have to specify the role of the user:
After adding the user to the project the user is added automatically to the group 'everyone' which has only access to the project. If you want to edit everything regarding the project to have to add the user to the administrators group.
Regards,
Marian