We have implemented Shared iPads in our environment, and for some reason the Markup feature in Safari has disappeared. We've found that our normal 1:1 iPads in the environment have the feature, so we're trying to figure out if this is another Shared iPad "quirk" or if it's merely a setting we have that's accidentally restricting the feature.
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Markup feature missing from Shared iPad

Best answer by kforce_rholt
I discovered that it was merely a setting disabling it. In Configuration Profiles, there was a profile with the Functionality Restriction of "AirPrint" being restricted. Once we allowed it, Markup immediately appeared as an option on the iPads again.
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