[Firmware 7.0.0] - Stitch not running

Good morning,

  this is my first post on the forum so, hi all :)

I'm trying to setup a "stitch" to push the configuration to an tftp server whenever the configuration changes. The firmware my firewall is running is 7.0.0. The tftp is working fine: if i force a push via cli with the following command:

execute backup config tftp /backup/fortigate.cfg 192.168.7.12

The "action" (security frabric -> automation) is defined as below:

    edit "PushTFTP"
        set description "Push config to TFTP"
        set action-type cli-script
        set minimum-interval 60
        set delay 10
        set script "execute backup config tftp /backup/fortigate.cfg 192.168.7.12"
        set accprofile "super_admin_readonly"
    next

As trigger, I'm using the default "Changelog"

The stich is defined as following:

edit "Cfg2TFTP"
        set description "Send config to TFTP when changed"
        set trigger "Changelog"
        set action "PushTFTP"
next

If i test it with the "Test automation stitch" option (mouse right click on the stitch) I get a green flag saying the stitch has been triggered successfully and the trigger count increases but no file get uploaded/updated on the tftp server.

Can someone help me understand what I'm doing wrong and how to fix it?

Thank you