Person selection in IT Shop request form

I am creating an IT Shop request form that needs to include several Person UIDs that will be used as reference contacts for the request.  I have created the foreign keys to Person in ShoppingCartItem and PWO.  I have set edit and view permissions for those columns as I did for the other custom fields I added.

The request form displays the expected Assign button and list of Person objects to select, but when I try to select a person, I get the following error:

The search index is indeed working, at least for the built-in Department selection.  Any ideas what I might be missing here?  Are additional permissions needed?

 

Thanks!

Ellen

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