Push Notification Authentication for RADIUS 2FA request (RD Gateway)?

Hi, i’m testing around with the Remote Desktop Gateway with local NPS and can’t get it running. I always get the Error “ERR905: Missing Parameter: ‘pass’” on the freeradius if i try to connect with Push-Token over RDGate.

The freeradius runs well with TOTP.
Which config do you use on Microsoft Site?
I can’t find a solution to set “pass” in the NPS. I thing i’m making here somthing wrong.

I set up the NPS like this:
https://netknights.it/en/nps-2012-for-two-factor-authentication-with-privacyidea/

The communication way look like this:
User(RDP)->RDGateway->localNPS->Freeradius->PrivacyIDEA->Push Token->User Acknowledge

I would be grateful for a more detailed description of the NPS configuration.