Specific error for unsollicited response

[baszoetekouw]

Jun 24 11:28:50 docker8.prd.utr.surfconext.nl engineblock[827]: {"channel":"engineblock","level":"ERROR","message":"Unsolicited assertion (no InResponseTo in message) not supported! | Caught Unhandled EngineBlock_Exception","context":{"exception":{"class":"EngineBlock_Corto_Module_Bindings_Exception","message":"Unsolicited assertion (no InResponseTo in message) not supported!","code":0,"file":"/var/www/html/library/EngineBlock/Corto/Module/Bindings.php:337"}},"extra":{"session_id":"06d00f7bfdadf8eb16f43bb9f9c784cf","request_id":"685a6fd220307"}}

leads to /feedback/unknown-error

Instead, create a more specific error with this explanation:

Your sign-in could not be completed because the login request was initiated in a way that isn't supported.
You were sent directly to this application by your identity provider (e.g. via a bookmark, portal tile, or saved link) without first starting a login from this application. This is not supported.
Please start again from the service you were trying to access and log in from there.