Secure Lockdown Chrome edition printing doesn't work

Hello!

I am trying to configure a kiosk system locked to one page with the ability for printing of pdf documents.
Usualy a new window with the print preview opens but I can't find the correct setting so that it will work when Secure Lockdown is enabled.
I always get a "sad paper image" with "Requests to the server have been blocked by a policy."

Can anyone give me a possible setting?
At chrome Lockdown -> general -> is no checkbox selected
Layout is kiosk mode selected

Thanks

When Chrome is not locked down, what is the URL that is displayed after selecting the print link?

Okay, I have found the problem:
First of all I needed to allow chrome://print
and then also the site that is being opened BEFORE chrome://print

Thanks you.

Yes. Correct.