Hello, I purchased an AX11000 router to replace an AC4000 router.  On the AC4000, I had enabled bridge mode for IPV6 and that worked fine.  For the AX11000, I have enabled bridge mode using the default MAC address, but when I test IPV6, I can’t get connectivity.  I tried Dynamic IP and this doesn’t work either.  I tried PPPoE but the option to use the same session with IPv4 is grayed out (can’t be chosen) and when I use my ISP Username and Password, it won’t connect.  I tried the 6to4 Tunnel option and that does return addresses but again the IPv6 test fails.  I have rebooted the modem and the router.  Internet is with Xfinity.