FP3 IPv6 Hotspot not working

My SIM card only supports Ipv6 (B&You by Bouygues, a French ISP), but when I want to share my cellular connection to my laptop it doesn’t work. It does work with the simcard of my gf (another ISP, IPv4).

With some googling I found this: https://issuetracker.google.com/issues/36949085. You will find that google developers are really mature beings… I tried to install https://play.google.com/store/apps/details?id=org.daduke.realmar.dhcpv6client on my phone but I lack root access. Is it possible to enable root access without having to install a whole new OS?

Or is it possible for Fairphone’s team to implement DHCPv6 on their android OS natively? The sharing of my internet connection works when I put the SIM card in my gf’s phone (Oneplus 7), so either they have enabled DHCPV6 or I’m completely wrong and Fairphone has another problem with IPv6 and internet sharing.