Multicast forwarding in VPN session

Hello

Have an application on mobile that uses SSDP protocol to discover controller`s IP address and then connect to it. Controller - device in the local network
So, when application starts, I see in WireShark that from mobile IP always sendings packet to the 239.255.255.250 with request

But, when mobile connected to the local network via VPN (L2TP) and application starts, there are no such reqest to 239.255.255.250

Is it possible to forward this multicast requests from VPN client to local network ???
Don`t know for exactly if it is possible with Mikrotik ?

mobile device is iOS and it can handle only L2TP, IPsec and IKEv2

If there are no solution could anyone explain why this happens ?
So my mobile sends requests to 239.255.255.250 (port 1900) every time it starts, so why it would`t do the same while connected via VPN ?