Seeking assistance with running shell script from HA

Howdy. I have a bash called backup.sh script in /config and I've added the shell_command to configuration.yaml:

    
shell_command:
  backup: /root/config/backup.sh


  

I'm running HAOS, the shell script has the correct owner:group and permissions. I can execute the script when I ssh into HAOS, but when I call the Shell Command: backup service from HA's Developer Tools, I get:

    
stderr: "/bin/sh: /root/config/gitupdate.sh: not found"
returncode: 127

  

Any thoughts on this?