Enable preemptive authentication von ECP
It's possible that the IDP v3 wants a preemptive authentication on it's ECP Endpoint on a standard configuration. Not tested yet, but does no harm anyway to make the auth preemtive, because it's mandatory.
It's possible that the IDP v3 wants a preemptive authentication on it's ECP Endpoint on a standard configuration. Not tested yet, but does no harm anyway to make the auth preemtive, because it's mandatory.