I am in the process of updating PrivacyIdea and simpleSAMLphp. Unfortunately, I can't get this to work, because no attributes are received from the PI server. The reason is that the endpoint "/validate/check" is used instead of "/validate/samlcheck".
The old implementation that was working fine used the "/samlcheck" endpoint, the new one does not. Changing just the endpoint is not enough, it crashes later.