Issue
How to allow the user delegation from the Service Portal
Release
ALL
Resolution
To allow user delegation from the Service Portal, Add a link to your SP Header Menu for a list view of the Delegates table, with the below link
https://InstanceName.service-now.com/sp?id=list&table=sys_user_delegate
From the above list, users can create a delegation.
Also, this can be achieved using the below URL (Avoiding to show the List)
https://InstanceName.service-now.com/sp?id=form&table=sys_user_delegate&sys_id=-1