Hi @ClarkyPA365 ,
I was kind of combine the LookUp function in your screenshot with the Concat function in my post, just using the list column name I assumed.
I'm not sure about how you are selecting items then navigate to the form screen, and what is the Item of the form? I didn't see the Combo box but only a Gallery instead. I was assuming that you have a multiple selection Combo box where Items is a person column, and will get a employees table when several employees are selected. Using the formula in my post, you will be able to get a concatenated text which includes multiple employee's ID corresponding to the employees selected in the combo box.
As you provided the formula of the ID from in the Gallery, I can make the formula for IDs more specific:
Concat(
AddColumns(
Combobox.SelectedItems,
"EmployeeNumber",
LookUp('Employee LookUp', Title = ThisRecord.email, 'Employee Number')
),
EmployeeNumber,
"," && Char(10)
)
Hope this helps.