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Update the 'Reminder Set' Field for a Salesforce Task or Event Object

Fecha de publicación: Jun 15, 2026
Descripción

When you use a Salesforce Flow (or Workflow Rule) to update the Reminder Set field on a Task or Event record, the reminder may not appear as checked (enabled) even after the Flow runs successfully.

This behavior occurs because the Reminder Set field requires two field updates to function correctly:

  1. The Reminder Set field (boolean checkbox)
  2. The Reminder Date/Time field (a DateTime field with a specific future date and time value)

Without updating both fields in the same Flow action, the Reminder Set field remains unchecked on the Task or Event record.

Prerequisite: The Enable Activity Reminders setting must be enabled in your org for reminders to function. To check this setting:

  • In Lightning Experience: Setup | Sales | Activity Settings | Enable Activity Reminders | Submit
  • In Salesforce Classic: Setup | Customize | Activities | Activity Settings | Enable Activity Reminders | Submit
Solución

How to Correctly Set the Reminder Using a Flow

When you create a Flow to update a Task or Event record and set a reminder, you must include two separate field update elements in the Flow:

  1. Reminder Set — Set to True (checked)
  2. Reminder Date/Time — Set to a valid future DateTime value (for example, the due date of the Task minus 15 minutes)

Why Both Fields Are Required

Salesforce only displays the reminder alert when both the Reminder Set field is True AND a valid Reminder Date/Time value is present. If the Reminder Date/Time field is left empty or null, the Reminder Set field displays as unchecked on the record, regardless of what the Flow sets.

Example Flow Configuration

In your Flow, when updating a Task record, include an Update Records element with two field assignments:

  • Field: ReminderSet | Value: true
  • Field: ReminderDateTime | Value: A formula or variable that calculates a valid future DateTime (for example, {!Task.ActivityDate} - 0.010417 to set the reminder 15 minutes before the due date)
Número del artículo de conocimiento

000381955

 
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Salesforce Help | Article