Hi @Anonymous ,
Do you want to get the table which has the Address’s TCG# is match your second table?
I think you can change your formula expression as next:
Initial Collection: ClearCollect(CollIncompletesv6, Deactivation Incompletes)
Add Address Collection:ClearCollect(collUpdated6,AddColumns(CollIncompletesv6,”AddressLot”,LookUP(‘Master List’, TCG#= CollIncompletesv6.TCG#,Address)))
I test as this:
Button.Onselect: ClearCollect(test2,'[dbo].[Table_20190222DI]');ClearCollect(test3,AddColumns(test2,"Addresslot",LookUp('[dbo].[Table_20190222MasterTable]','TCG#' in test2.'TCG#',Address))) (on your side you can change to your tale’s and column’s name)

Result:


Hope this can be helpful.
Best Regards.
Yumia