Different subnets in local LAN

I successfully installed jitsi meet in my local LAN but now I face a new issue: I want to use it across different subnets.
I have 2 subnets:

  1. completely separated subnet without internet access with server at ip 192.168.188.2 for guests
  2. normal network with internet access with server at ip 192.168.178.20

The server has 2 NICs and connects to both subnets.
In the configs I can put the Docker Host IP but if I enter the ip for the normal network then jitsi meet doesn’t work in the separated subnet.

Is there a way to use it in both subnets?

(Both subnets use a local DNS server with dns rewrite to point to the server so I can have a valid certificate so it even works with the app)

Does anyone have any knowledge about how to configure jitsi to work with 2 different networks? p2p is disabled and not needed.

i have similar issue, clients from different subnet cannot join same room,
,this solution works with me,
Allow All Incoming HTTPS
To allow all incoming HTTPS (port 443) connections run this command:
sudo ufw allow proto tcp from any to any port 443

It got solved in:

(btw: I don’t use any firewall)