When you delete an unauthenticated access user, you must also remove the application pool entitlements for the user. You cannot delete an unauthenticated access user who is the default user.
- In Horizon Administrator, select Users and Groups.
- On the Unauthenticated Access tab, click Delete.
- Click OK.
What to do next
Remove application entitlements for the user. See " Remove Entitlements from a Desktop or Application Pool" in the Setting Up Published Desktops and Applications in Horizon 7 document.