I'm not sure if you have found this (the thread is a couple of years old), but I was hunting for a resolution for the same problem and came across this thread. In ArcGIS Pro 2.3, the following registry setting will set extensions active without requiring the user to access the "Licensing" option in the Project menu. HKEY_CURRENT_USER\Software\ESRI\ArcGISPro\Licensing\Extensions
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