Cant find audio device

Hi…i seem to have lost my wifi connection to my denon ceol9 audio device on windows 10 ?..It was working up until last month…Anyone any ideas how i can get it back ?..thank you.

How is your ceol n9 connected to the network? If in Wi-Fi check in the settings menu if you can connect it to your WiFi network

… and check how is your pc WiFi connection is defined in Windows 10, it should be Private (not Public)