It seems that the problem was related to my Moto X Force smartphone, which was not able to connect the controller to my Wi-Fi. I have now tested it with a Pixel 3a XL and it did work on the first try.
Chromecast Ultra connects to WiFi fine, controller does not. Have WiFi 6 routers (AX, certified WiFi 6), logs show it authenticating with the wrong PSK. 100% using the right one. 63 character long PSK with two apostrophes in it. Where do I report the controller bug?
I'm having the exact same issue. Strangely, I was able to connected it to the guest version of my network, but when I attempted to sync with the chromecast, I'm able to input and connect based on the pattern on the screen and the controller vibrates. I then get the same linking pattern to connect the controller, but it fails.
Ironically, I'm using Google WiFi. So much for ecosystem compatibility.
I've the same problem the Chromecast and all other devices like TV(Sony, Samsung) mobiles(IPhone, Huawei) are working fine.
Asus RT-AC86U Router - 2,4&5Ghz Wifi.
The problem here is the WPA 2 AES, WPA AES/WPA AES+TKIP encryption. If you have a "open system" the controller can connect.
Fritz Powerline 1240E WLAN - WPA 2 is not working
I assume it s a firmware problem.
I had the same problem. I don't know which of the following really worked.
It finally worked at the end.
I hope this helps.