My mistake. Users were not added into any group :blush:
Hello,
I have installed CB 1.8.1 but can't synchronize users. Site migrated from joomla 1.0 but I think that here is no problem, because joomla 2.5.6 site have 745 users, fresh installed kunena have 745 users but fresh installed and synchronized CB 1.8.1 have 6 users...
This is not first time when I use joomla + kunena + CB, but it's first time when I can't synchronize users.
Thank you for response, but "bad migration" does not apply to all cases. How you can see, the problem is solved - after migration I just forget assign users to any group.