I'm trying to activate ipv6 connection over PPPoe (mirror my ipv4 connection) but when i try to save i just get the error "failed to save the information. Please try again later"

Does anyone know how to stop this appearing as i've reboot the devices (xe75 pros), rebooted by phone, installed the app on another phone. Short of factory resetting my devices and starting over with my configuration i'm running out of ideas so thought i'd ask on here first

Thanks