I'm sorry, but i don't get it.
I now tried to redownload the Citrix Receiver 12.6.
I used an old package (the first version of Citrix Receiver we installed, which was working).
I created a new Policy
Nothing is working, expect my own Mac.
I will post the jamf.log and install.log here, maybe someone has a clue: Download Citrix Receiver 12.6 Mac
Download
https://cinurl.com/2wH00c
eebf2c3492
--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)