Orbi Netgear GS908E-100PES Backhaul Connection

Hello, everybody,

I have been using the Orbi Set (RBK23-100PES) for a few days now, i.e. router + 3x satellite.

Because of reinforced concrete walls and underfloor heating, I only get a yellow signal from one floor to the other, which is why I decided to use the Backhaul method. Unfortunately, I can only connect one satellite directly to the Orbi Router, as it has only 2 LAN ports and one is already connected to the router or switch. The other satellites would have to be brought to the basement or the attic by switch, but the MANAGED switch doesn't seem to want to play here. The wired connection is not established. Is there a setting for it to work? Or do I have to switch to the UNMANAGED version?