If you report this error, please also report this tracking number which makes it possible to locate your session in the logs available to the system administrator:
86cc580c03
The debug information below may be of interest to the administrator / help desk:
SimpleSAML\Error\BadRequest: BADREQUEST('%REASON%' => 'Missing AuthState parameter.')
Backtrace: 2 modules/multiauth/www/selectsource.php:15 (require) 1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process) 0 www/module.php:10 (N/A)
This error probably is due to some unexpected behaviour or to misconfiguration of SimpleSAMLphp. Contact the administrator of this login service, and send them the error message above.