Thread:Extension talk:OpenID/OpenID Provider/reply

Solution: in your LocalSettings.php set

$wgOpenIDClientOnly = false; // false means: allow to act not only as client, but also as OpenID server (you wanted this) $wgOpenIDAllowServingOpenIDUserAccounts = true; // check, if you want this. For tests, set this to true

The article page and the README explain the meaning of all switches.