@v-qiaqi-msft
Items property of AdminTaskCategoryDropdown:
'Task Category and Expense Type List'
The dropdown is a dropdown, not a combo box. The data cards use drop down controls.
This code appears to work (as I no longer have errors):
{Value:AdminTaskCategoryDropdown.Selected.Name}
BUT, I replicated everything from different screens. Basically, I swapped out "SelfTaskCategoryDropdown" to "AdminTaskCategoryDropdown", and I made the appropriate changes in the properties, but they were supposed to be identical, hence the initial code of admintaskcategorydropdown.selected.name because selftaskcategorydropdown.selected.name worked.
I hope that all makes sense. I don't know why the property code works for one and not the other.