thank you for you patience :)
but my problems is before point 1 ... the rest is ok
After i click to my Wifi guest .. the normal scenario is show automatical browser page; in windows load the complete browser.. in Apple device load a WEBVIEW a minibrowser..
and the issue happened when I change the auth-portal setting on FGT linke this:
config firewall auth-portal
set portal-addr "falcon.XXXXXX.it"
When I setup this in Windows enviroment the page authentication still appear, but in Apple devices ( Mac, iPhone, iPad .. ) no longer appears.
If I unset the portal-addr the redirect to FAC goes ok " https://fac.XXXXXXX.it/portal