AS923 not recevied information

Hi All;
I create single channal gateway with 923.2MHz. When I send information from End node on 923.2MHz. It’s not recevied information or anything. I would like to know why not recevied but when I use 868.1MHz. I can received information.

Have you checked

I see message of MQTTT. I use to single channel library in raspberry pi. When I use 868.1MHz. I can received message but when I use 923MHz. I can’t received message.