Hi @Moores35TFL ,
Assuming there is one Approver per Department in your SharePoint list and the Combo Box is a single select control:
If Department is a SharePoint Choice field:
LookUp(
'Your Data',
YourComboBoxValue.Selected.Value = Department.Value,
'Your Person Column'.Email
)
If Department is a Single Line Text field:
LookUp(
'Your Data',
YourComboBoxValue.Selected.Value = Department,
'Your Person Column'.Email
)
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