To handle a field change from null to a value with the update message, ensure your plugin checks for both the old and new values. The update message triggers only when the field's value changes, but a change from null to a value should still fire it.
null
If it’s not triggering, explicitly check for null in your plugin logic:
if (context.PreEntityImages["PreImage"].GetAttributeValue<Type>(fieldName) == null && entity.GetAttributeValue<Type>(fieldName) != null) { // Handle the change from null to value }
Alternatively, verify your plugin registration includes Pre-Image with the field and the update message is configured correctly.
This is a known challenge in Dynamics 365/CRM plugins.
When you set a field to null in Dynamics:
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