Unfortunately, only 2.4Ghz connection. Public WLANs where you first have to register in a portal (e.g. enter your room number or accept the terms of use) are also not suitable. We usually use a mobile hotspot for this purpose.

Unfortunately, it only works with 2.4.
That's what the instructions say. I always have problems with hotels etc. because they run on 5...
I have also been annoyed several times....