@kislorod Here's a thread in the US community discussing a similar issue.

@Pimania In general, TP-Link routers support multicast from the internal network (LAN), but support for specific features depends on the model (Home vs. Business grade devices) and configuration....

@Pierre-Jean Archer BE550 Pro is a home grade router and it doesn't support any advanced fetures that you need in your particular scenario. Configuring the H.A. as an isolated device, it won't see...

@phil75 Here's the procedure for recovering a bricked TP-Link router. If that doesn't help, your best bet is your local support.

@Qball17 Read this blog for start. Onemesh is a TP-Link proprietary technology and that's why it's not compatible with the Easymesh standard. However, you have a chance to make them work together -...

@Pierre-Jean Here's what's the purpose of the IoT network implementation. Understanding IoT network and isolation - here and here.