"Authorization has Failed" message shows up, but login works fine

On my test-server I see the "Authorization has Failed" error message, but the authentication works fine, so either the message shouldn't be displayed or the login should have failed.

It would also be nice to have a "I have seen the message" button, to hide the error.

Reproduce the authorization flow on the reported test server and trace where the failure message is emitted relative to successful authentication. Determine whether the message is shown only for failed login attempts or needs a dismissal control; done means successful login no longer shows a misleading error, with the chosen behavior covered by verification.

Written by the indexing model from the issue text.