I have created a media type script to set up SMS alerts using the mailjet API but it is never executed. The script is in the AlertScripts path

If I try to run it in CLI, it works (in root or zabbix user). This also works with the test action on the media type. But when an event alert is created for a host group specified in the conditions of the action that calls the script, nothing happens.

I tested to create a simple script creating a file in case of call but the situation is same.
So I don't understand why Zabbix doesn't call any script.