@Shedlly Please try enabling the Remote Management on the C3150 as follows, then check again if you can access it from the iPhone or Windows 10: How to set up Remote Management on the Wi-Fi Routers...

@Gentaro Thank you very much for getting back with the detailed info. Do you mean if you switch the AX20 to router mode, the IPv6 works fine without changing anything additional settings on the AX20?...

@Paul_007 Hi, I found you have already opened another thread below, please check my reply: https://community.tp-link.com/us/home/forum/topic/543156 Please don't create duplicate topics to report or...

@DBOC It's great to know you got it resolved by resetting the router to factory defaults and reconfiguring it manually. We will also keep an eye on similar feedback to understand how this happens in...

@DaDm Hello, this could not be a universal issue as we didn't receive similar feedback and this version had been released for more than one year. So I would suggest resetting the router to its...

@Shedlly I would suggest going through the troubleshooting suggestions here below, I think your case belongs to Q4 in Case 1: What should I do if VPN doesn't work on Wi-Fi Router? If none helps, we...