Quote Originally Posted by Jillian View Post
This is probably a longshot but, is there any chance you're using a VPN? My friend and I both got that error (at least I think it was that one) when attempting to register to the Endwalker code. It worked when we both tried with the VPN turned off (we both use different VPNs). Never had this issue before with registration.
Zen has said that no VPN were used on the thread opening unfortunately