Issue sharing Dynamic view/Webapp with users

I have created a dynamic view and a webapp (We have an enterprise license) When I go to the sharing panel for both I can search and add some of my users, but not all… Normally on regular sheets my technicians are searchable as staff to add to assignments but here I am getting hit or miss results. Should I just add them by email or is there something else missing in the setup I don't know about?

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