We have the same issue and at POC state with apple Mac MDM product called Kandji. We opened a ticket with support but they also seem to not have an immediate solution as its been 6 days with ZERO helpful response. Hopefully someone here has done the same.

https://www.kandji.io/apple-device-management/ 

For Kandji, Here is the way to take care of this: 

Extract the downloaded file and compress it so it is a .zip and not a .tar.gz

Create a custom app in Kandji and follow the screenshot. 
 

For Kandji, Here is the way to take care of this: 

Extract the downloaded file and compress it so it is a .zip and not a .tar.gz

Create a custom app in Kandji and follow the screenshot. 
 

 

This absolutely worked for me in Kandji! Thanks Invoca.

Hello,

Together with Mosyle support and this help article I solved this for Mosyle.

Download the Agent from Freshservice, unzip the folder and use the built in Disk Utility pkg creator on the folder called FS-Agent. In Mosyle go to the Install PKG profile type and upload the .pkg you generated with Disk Utility under the CDN tab.

Go to the PKG Tab and add a new package and choose the .pkg file uploaded to the CDN. Add the Post -Install script from above:
 

#!/bin/sh

/usr/sbin/installer -pkg /var/tmp/FS-Agent/FS-Agent.pkg -target /

Once you’ve finished this step go to the Profiles tab and create a profile containing the PKG you just created and choose which devices you want this assigned to. Works like a charm!