I would check if $To_Accounts is an empty string and if it isn’t append a comma before the FullName.
if $To_Accounts != empty then
$To_Accounts + ',' + $IteratorBackOfficeEmployee/FullName
else
$IteratorBackOfficeEmployee/FullName
hi, Alejandro Castrelo, I meet with you same question. How to solve this question? Can you tell me.