Hi @unknown ,

Do the following.

1. Create a schedule job with below script.

var gr = new GlideRecord('change_request');
gr.addEncodedQuery('due_dateRELATIVELT@minute@ago@45');
gr.query();
while (gr.next()) {

    gs.eventQueue('your event name', gr, gr.assigned_to, '');
}

2. Create event based notification: you can get help from here in case you dont know: https://servicenowwithrunjay.com/email-notification/ 

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Regards
Runjay Patel - ServiceNow Solution Architect
YouTube: https://www.youtube.com/@RunjayP
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