My Anycubic wouldn’t connect to my WIFI, it recognised it was there but would not connect. I changed the SSID by adding a number 1 to the end, not so massive a change to affect other devices too much and it connected straight away, hardly scientific but worked for me. I have MESH too but that is also set to 2.4GHz not 5GHz, was told the printer would only connect to 2.4GHz, might be worth a try.