connecting to the hotspot the browser popup doesn't open

Hi,
lately connecting smartphones to the hotspot, the browser popup on the capive portal page doesn’t open.
In the past I already had this problem on Android and iOS, but allowing some domains which smartphones tried to contact (e.g. apple.com) in the walled garden I solved.
now this doesn’t work anymore.
I even tried to log firewall hs-unauth rules, and allowing all domains and ips which smarphontes tried to contact but still nothing.
how can I solve?
Thanks

no one had this problem?