Hello,
I've followed the UN-444 "bug" to learn it's related to ZD 9.13 new "feature" to allow HTTPS
URLs for Guest Access redirection. For Guest WLAN the client HTTP request gets translated
to HTTPS by ZD/Master AP, and won't trigger Apple pre-launch browser. Users need to open
Safari to finish guest authentication. This is a limitation for ZD 9.13 and Unleashed 200.2 today,
that DevEng are researching for a possible fix, hopefully by the next release.
It would still be helpful if you open a ticket, that can be linked to the bug for visibility, that helps
drive priorities.