How to trigger a Notification from a button in subject body

[TR5]

So I have a requirement for an hr case table in which I have to send 2 notifications 1 is to the subject person and the other is to the Assigned to person.
Scenario is when hr case is created a notification should be sent to the subject person, and that notification body should contain a "confirm" button, when the subject person clicks on that button then another notification should be triggered and should sent to the assigned_to person. 
how can I achieve this?

[Jaspal Singh]

Hi,

A bit strange use case.

1. Once a mail is sent to subject person. You may need an inbound email action or flow action to processing the confirm action

2. May be a field can be created to be updated as soon as user confirms via the inbound mail action or flow action

3. The field created in step 2 can be used in notification When To run condition for a notification to be triggered to assigned_to

[Wybren1]

Options you have:

• Guide the subject to the portal and let them confirm there on a button, emails are a bit tricky.
• A button that creates a new email with a specific subject that can be picked up by Inbound Email action as Jaspal mentioned. (Very confusing for users if I have to be honest)
• You could try Outlook actionable messages 
  https://docs.servicenow.com/en-US/bundle/vancouver-servicenow-platform/page/administer/outlook-actio...
• A button that send the subject to a specific portal page that will accept the input right away.
  Example: https://instance.service-now.com/sp?id=confirm&subject=user_sys_id&case=case_sys_id

Hope that helps