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Possible conflicts between Jamf's Restricted Software and macOS installations
When deploying a macOS installer in an upgrade or erase and install workflow, the update process fails shortly after starting.
If triggered via the command line (/usr/local/munki/managedsoftwareupdate -vvv), Munki will show one or both of the below error codes:
startosinstall failed with return code 255
/ is not a CoreStorage disk
If attempting to run the macOS installer App manually in the GUI, this will also fail.
Check your Jamf Pro Server for "Restricted Software" settings ("Computers" > "Restricted Software") that could be blocking the macOS installer App (either a wildcard or specifically the version you are trying to run). Exclude this device/s or remove the restriction.
The "Restricted Software" option will also affect command line installations, therefore will also affect the Munki side of the deployment
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