How to re-subscribe a user who unsubscribed an email notification accidently?

Oscar Espinoza_z6svo4

The below appears in the body of the ticket email.
It seems the user may have clicked the "Turn off this request's notifications" hyperlink because they are no longer receiving email notification from Jira.
I went to the "Notification helper", and I see the user shows an "!" in a yellow triangle stating "{username} does not get notified of their own changes"

----- Body of Email ----

View request · Turn off this request's notifications

Please use link to response to this email. This mailbox is not monitored.
----------------------------------------------------------------------------------
How I can reset this user so they get an email notification when they are either the 'Reporter' or a 'Request participant'
Thank you

Dan Breyen

A Portal user can change the notifications on a particular ticket right from inside the portal.  When they are looking at the issue they can toggle notifications by clicking the 'Notifications ON/OFF' label.

Hope that helps.