Automation that triggers on field update not field adding

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Automation that triggers on field update not field adding

Dear all, I searched the forum and faq section for a ‘similar’ problem, but until know i havent found any workable solution for my challenge. So i hope you can help me to figure out the best solution. The problem: I have a custom field where customers fill out their bank account number, the field gets filled out perfectly in AC and so far no problem. My issue is that out administration/backoffice department want to receive an alert (mail) whenever on of the customers changes their bank accoun…