UniFi Guest Network Issue?

I’m trying to get the UniFi guest network up and running, and having some trouble.
The controller is on vlan 300; 192.168.10.100
The guest network is on vlan 330 192.168.13.0/24
Firewall rules, allow all traffic from WLAN (controller) > WLAN-Guest
Firewall Rules allow 8080 8843 8880 from WLAN-GUEST > WLAN (controller subnet)
I’ve tried the facebook guest configuration, and just standard guest portal.
When I connect to the guest wifi network, it just takes me online, no captive portal or anything. Something I am missing in my configuration?

So how exactly is this question related to MikroTik devices?

I guess he tries to use a MikroTik router with a UniFi WiFi setup (controller and accesspoints).
That is perfectly possible, I do that as well.
But of course it is impossible to answer “questions about the configuration” with so little information given, and not even the actual configuration.