Custom Trigger for Multi-Select Field

Custom Trigger for Multi-Select Field

I've hit a wall and need some suggestions.

I have a Multi-Select field on my On Boarding form that has a list of all our different applications available to our users. I have Field and Form rules in place that filter this field so it only shows apps that apply to the department that is currently selected.

Some of these apps require a notification to be sent to an individual in a department. That way this person knows that a new person needs to be provided access to the required application. These few folks are not technicians in ServiceDesk so they do not have a license. Because of that I'm unable to assign them a task. 

I also cannot build a custom trigger for an email notification because the field with all the applications listed is a Multi-Select field. I'm working on trying to get a Python script with an .xml file to send out a message. But I still have no way to trigger it that I can think of. 

If I was able to create a custom trigger based off of a Multi-Select field then I would have no problems. 

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