Hello @kathryn basile
Welcome to the Atlassian community.
Is this a Kanban board that references a Company Managed project or a Team Managed project? You can find out the project's type by looking at the View All Projects page under the Projects menu and looking at the Type column for the entry for your project.
Notifications are driven by the Notification configuration for the project in which an issue exists. The Notifications configuration can be at least viewed by a user assigned the Administrator role in the project, by navigating to Project Settings / Notifications.
That configuration should be reviewed to see if it includes activities that are occurring on the issues in the project.
Each user can also manage some notifications settings for themselves. Click on your avatar in the upper right corner and select Notifications. Through the resulting page a user can disable both email and in-app notifications for themselves.
If both of these have been examined and indicate there should be notifications sent, then the next thing that can be examined is for the users to check their email client Spam/Junk Mail folder for the notifications, and check if they have any automations set up that might be eliminating the emails sent by the Jira system.
You can also go to your tech support team to find out if they have set up your email handler to block the emails.
If all that is found to be set in a way that emails should be coming through, then it is possible that the individual users' emails have been blacklisted by Atlassian. Your Jira Administrators can open a support ticket directly with Atlassian to find out if that has occurred and get it fixed.
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