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The debugsp allows you to logon to any SP offered by your SimpleSAMLphp installation. This is similar to the functionality on the admin/test page but using debugsp does not require you to login as the admin user. This can be useful if an IdP you are talking to wishes to verify that a login session can be created using your SP and their IdP.
You need to enable the module in config.php
'module.enable' => [
'debugsp => true,
…
],Visit the link debugsp/test at your site. All the SP you have configured will be listed. You can try to login as an SP. Once successful you will see a list of the attributes the IdP supplied. You can then logout again and test another SP if desired.