Back in the day, pre-catalina, a lot of macadmins blocked macOS from updating in their WS1 environments.
To do this they deployed a device profile in WS1 with the following Custom Attributes.
However if you want to re-enable the upgrade one option is to deploy a new profile with the following Custom Attribute.
#!/bin/sh
ignored=$(/usr/sbin/softwareupdate --reset-ignored | tr -d "\n" | cut -f2 -d':')
echo $ignored
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