Executing call system from sqr

We've got a number of SQRs executing a Call System command, but this one (actually 2) won't execute.
let $sender_cmd = '/usr/bin/sudo /usr/sbin/usermod -c "Human Resources Administration " appuser'
call system using $sender_cmd #sender_status WAIT
#sender_status is returned with a value of 1
This is supposed to allow "appuser" to change the server email sender to "Human Resources Administration ". When the sqr is about to end, it changes it back to the original value.
I've tried putting the string in a shell script and executing it, but it fails that way too.
Any suggestions?

BTW the command runs fine from the command line (Linux 5.0)

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Executing call system from sqr

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