If you're really stuck, and it sounds like you are, you can use a DFU reset. Put the iPad into DFU mode and then use Apple Configurator to re-enroll the device. If it's already in DEP, Apple Configurator will reset the device and then it should automatically pull its configuration when it restarts and checks authoriziation.
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This site is great for making a Dock profile. Then I import the mobileconfig. https://techion.com.au/blog/2015/4/28/dock-master PS: Some of the URIs for things like System Preferences will have to be updated for Catalina, as they moved some system apps out of /Applications and into /System/Applications
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