If the satellite connects on 2.4 GHz, that generaly indicates the 5 GHz signal is too poor to connect to the router. I would suggest relocating the Orbi router and/or satellite so they are closer together or have fewer walls between them.
When I look at my wireless with Wi-Fi Analyzer, I always see an unlabeled SSID on both 2.4GHz. and 5GHz. And yes, I get full speed despite that. Don’t really know how the Orbi divides its backhaul traffic between 2.4 and 5GHz., just that it has an available network on both bands. Works really well, totally stable.
