Use this page from a kiosk Chromebook to see whether PHP can see the signed-in kiosk email.
No email detected
If this is blank, your host is not receiving the Chromebook/Google email yet.
No matching kiosk found.
If an email is detected, make sure it matches a kiosk account exactly.
No common authenticated email headers were found.
After enabling auto-detect, open:
/bravespass/kiosk.php
If an email is detected and matched, the room should load automatically. If not, it will fall back to the room selector.