Cetus MK3 ... connect wifi

Hello,
i got a cetus mk3 today.
Works fine … but connection the printer to my wlan doesn’t work.

I found other posts with wlan problems … but i found a solution.
I own a avm fritz-box. 2,4ghz and 5ghz are running with same ssid und i use wpa2.
Thanks
Regards
Jürgen