[otrs] Agents do not receive the notification for email activating the CustomerGroupSupport

[daniele.otrs]

Hi,
I have activated the CustomerGroupSupport within SysConfig  Frontend:Customer in order to manage the Customer-Group.
Now if I open a TICKET from the Customer.pl page, the agents do not receive the notification for email. 
This only succeeds after to have activated the CustomerGroupSupport.
Why? 

Daniele
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