Hi JosDolmans
When you go to Windows/settings/XBoxNetworking, you can, on the right side check your connection
and it will give links to Microsoft websites how to solve this problem.
Because of your post I tried it and was successful.My PC had two problems,one with NAT type
and one with the server connectivity.Both were solved WITHOUT disabling IPV6 !!
Thank you for your post and the link within,which helped me.
Scott