Our developers are having issues with the default setting for Developer Mode.
For the development that they do they need to have
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Appx\AllowDevelopmentWithoutDevLicense = ffff (in essence not managed)
and by default this is set to 1.
Support tells me the only way to fix this is to send a Restrictions profile that is set to Allow Developer Unlock, but sending that profile has other unintended consequences in our environment. (setting UAC, telemetry, etc)