Hi Atul,
Thanks for your help. I have done all the above mentioned steps.
I resolved the same by giving Group everyone: read and end user permissions.
Path: Sys Admin - > Permissions - > Portal Content -> System(Mysystem)-> Permissions(Context menu -> open -> Permissions)
Chose Group and searched for everyone and click on add:
Then give Read and tick End User and save.
There you go.
System selection and mapping data is available to do user mapping in User Admin.
Thank you all for your help.
Thanks,
Harish