One user/agent is not receiving email notifications...!

[AnalyticVue]

One of our JIRA Service Management user (avsupport@analyticvue.com) not receiving email notifications when assigned or actions happened on the tickets.

[Dave Mathijs]

Hi @AnalyticVue welcome to the Atlassian Community!

Is that user by any chance also the Reporter of the issue?

[AnalyticVue]

Thank you Dave for quick response...!

No the user is not the REPORTER...!

[Dave Mathijs]

Ok, then I have a few other questions:

• When the issue is assigned to someone else, does that user receive an e-mail notification?
• Does the user AV Support receive other notifications or no notifications at all?
• Has the user AV Support ever received notifications or never?
• What are the profile notification settings for this user?

[AnalyticVue]

• When the issue is assigned to someone else, does that user receive an e-mail notification? YES... Assigned to an individual user... they are able to receive the email notifications.
• Does the user AV Support receive other notifications or no notifications at all? NO NOTIFICATIONS AT ALL
• Has the user AV Support ever received notifications or never? INITIALLY YES... RECEIVED WELCOME & PASSWORD RESET EMAILS, BUT TICKET RELATED EMAILS....NO...!
• What are the profile notification settings for this user? 
  >> Email notifications for issue activity - Send me email notifications
  >> Get email updates for issue activity when:
  You're watching the issue - YES
  You're the reporter - YES
  You're the assignee for the issue - YES
  Someone mentions you -YES
  You make changes to the issue - NO
  Note: Btw... the mentioned EMAIL ID is a group email ID.