How to show the user name on the success page of captive portal?
I've adopted the captive portal page to show our terms of service, ask for a user name, and then grant access. This is user the "none" authentication mode.
The success page then initiates a webhook to Microsoft Teams, which show a card with the time, IP address and Mac address of the client, just to show that someone has connected to the guest network. I would like to show the user name as well on this page, but it seems the post variable AUTH_USER is not available on the success page.
Can anyone suggest a method for making the user name available on the success page? Or is it already available in some form I haven't found?