This module accepts additional parameters depending on the available authentication requests. Use action=query&meta=authmanagerinfo with amirequestsfor=$1 (or a previous response from this module, if applicable) to determine the requests available and the fields that they use.
The database is currently locked to new entries and other modifications, probably for routine database maintenance, after which it will be back to normal.
The system administrator who locked it offered this explanation: The wiki is under maintenance. Das Wiki wird derzeit gewartet.
