Hello,
If you select "Do you need IPv6 addresses - Yes", it always results in an error "There aren't any bridges available". No matter if choosing obfs4 or none for the pluggable transport. Is that thing working?
There should be at least one available (with obfs4, too), or at least I was under impression that I run one.
As a side note, that page always loads in my native language with no way to switch to English -- pages which do this are the worst. In this case it means I can't usefully copy-paste you the exact error messages that I get.