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We have configured ISE for Guest users to be able to complete registration, which then requires to be approved by a group of IT administrators.
Approval request email is sent to a common mailbox. Approve or Deny link redirects them to sponsor portal,...
Let's not debate design decisions if it is alright. I appreciate that you are trying to help by simplifying it, but that option is not there at the moment.
Issue is sponsors are not able to see any pending requests.
Customer is not worried about overhead but wants to control who can or can't access guest network to whatever extent they can.