Problem Definition

Creating a notification scheme document mention that Group custom field value can choose value of Group Picker or Multi Group Picker field type.
However Group custom field value can select value of Select List, Multi Checkbox and Radio Button as well and this option will work as long as the custom fields store exact group names.

• https://confluence.atlassian.com/adminjiraserver/creating-a-notification-scheme-938847330.html

  Recipients
  The following types of recipients can receive email notifications.
  ...

  Group custom field value

  The value of a custom field of type Group Picker or Multi Group Picker that may have been associated with issues..

Suggested Solution

Suggest to add exact field type or remove Group Picker, Multi Group Picker