Elero/Schlotterer Variotel 2 868Mhz, no signal detectable

Hi all,

I got a remote for two different blinds. It is an Elero Variotel 2 type (28245.2101). Each blind is working on a different channel. While the remote is not recognized by flipper, I can record raw or raw bin on 868.35 MHz FM on the one channel. However, the second channel neither shows up in frequency analyzer nor spectrum analyzer, but it is working!? The manual mentions 867/868 MHz for EU (where I am) and 915Mhz for other regions. So shouldn’t I be able to at least see some signal? Could it be in the 867 MHz range? Should 867Mhz show up in the spectrum analyzer, or is it not supported?