macOS - FortiClient doesn't use the custom.conf

Hello,

I included my custom.conf to the macOS FortiClient installer. But the client doesn't know the configuration after installation.

I checked also the fctinstallpost.log

cat /tmp/cat /tmp/fctinstallpost.log 
Executing installer script: FortiClient --@@-- 
/Volumes/FortiClient/Install.mpkg 
/Volumes/FortiClient/fctdata/conf 
tcc_util reset Camera 
custom fct 
/Volumes/FortiClient/fctdata/custom.conf 
/Library/Application Support/Fortinet/FortiClient/bin 
/Volumes/FortiClient/fctdata/custom.conf is exist 
sw upgrade option: 1 
start FortiClient.... 
duplication run , so quit

So the installer recognize the configuration. If I import the configuration with the gui it works. Hence I guess that the configuration is valid. So what could be the problem? What could I check?