In Jira Server/Data Center up to 8.18.x, Jira users used to be able to receive Jira notifications without being granted Application access.
From Jira server/Data Center 8.19.0, Jira users now need to have Application access (and corresponding license) to receive a Jira notification (batched and non-batched).
Details regarding this: the old behavior was detected as a security vulnerability, as any user who has been revoked Jira access should also not receive notifications, since these notifications could include confidential information. See
JRASERVER-72737 for more context.
In the past, it was possible to take advantage of the old behavior and send notifications to users without application access ("non-login users"). For example, these "non-login users" were associated with a mailbox shared by a team.
Since Jira 8.19.0, this configuration is no longer possible.
As a Jira Administrator, I would like to create user accounts used only for corresponding notifications and not able to login to Jira. I.e. "Notification only" accounts.
Preferably those accounts should not consume Jira license.
Grant access in Jira to those accounts.