I’ve tried this setup and am still not able to connect not only Apple devices to the 6GHz network, but any other Wi-Fi 6e devices as well.
On Xfinity internet
Firmware Version:AC01.01.024_111023_G5X.04.20.121
SDK:QCA_Networking_2022.SPF.12.1 CS1
Wi-Fi Driver:WLAN.HK.2.8-01357-QCAHKSWPL_SILICONZ-1 v1
In this case we would suggest you to change the WIFI security mode for wifi6 the try connecting device to the wifi6. For this you need to first enable split mode on the interface then change the security mode to WPAWPA2-PSK (TKIP/AES)
This option allows Wi-Fi devices to connect with WPA (with TKIP or AES encryption) or WPA2 (with TKIP or AES encryption). To achieve best Wi-Fi performance in this mode, the Wi-Fi devices must connect using WPA2 with AES encryption.
http://arris.force.com/consumers/articles/General_FAQs/G54-Multiple-SSIDs-Setup
Gateway > Connection > Wi-Fi > Networks > click on edit for wifi6 > security mode drop down select more security option > WPAWPA2-PSK (TKIP/AES) > Save
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