DMZ forward to main privacyIDEA

Hi community! I have a question or problem.
I’m using a privacyIDEA server in a DMZ and a server on the LAN as the main server. Radius forwarding works perfectly, but I now want to use push token notifications.
My problem is that the DMZ server isn’t forwarding the request to the main server.
Can someone tell me what I need to set to forward the registration? I tried handler module federation, but that doesn’t seem to work.
I would be grateful for a little push in the right direction.

thanks!

What are you planning to do? Why do you want to forward s.th. from the DMZ to another server?
Are these both privacyIDEA servers with the same database?