OSX El Capitan IPv6-only Network Sharing not working

When I´m trying to connect to a IPv6-only Network Sharing via Wi-Fi (following the steps right here: http://ift.tt/1J3Sr1m), it fails on every device to connect (iPhone 6 with iOS8, iPhone 5 with iOS 9, MacBook Pro with 10.10.4).

It first connects, but then the activity indicator spins forever. Also, no valid IP can be found, so I guess it´s a problem with DNS that should be provided from the Network Sharing functionality?

When I´m running this Network Sharing without activating the option for 'IPv6-only', it works!

Any ideas? Is this working at your site or do you all have the same problem?