RAK 5146 can't access via WiFi

I have RAK 5146, and I installed it on RPi 4 with chirpstack-gateway-os. I can’t connect it using WiFi. I used gateway-config util and set SSID and password for my router, but it isn’t seen on my router in the section wireless connections. After restarting, I don’t see SSID and password remembered in the configuration (when I enter gateway-config next time). What do I wrong?
What should I do to enable it?