Unifi Network - Loewe YouTube Chromecast problems

[DBJ]

Hi all

So I moved my Loewe bild 3 to an other VLAN, my IoT network (now that we wont see any security updates anymore, it was time!)

But now I cant cast to it via. Youtube app on the iPhone, it don't show up

btw. I am running Unifi network

My firewall is as follows:
Allow Establsihed/releated IoT > Default LAN
Deny all from IoT > default LAN

mDNS is enabled cross all my VLANs

Does any of you use Unifi VLAN for your Loewe?

[234]

Bonjour (UDP 5353) allowed?

[DBJ]

Bonjour (UDP 5353) allowed?

I have mDNS enabled, that should be UDP 5353.

But maybe I should make an firewall rule for it, but it shouldnt be necessary when I have mDNS enabled across all my networks ?