Here are suggested steps for troubleshooting email notification issues for a specific document in SharePoint.

1. Check SharePoint settings for email notification to ensure that the correct options have been selected for the document in question.
2. Confirm that the user performing the action has the correct permissions to receive email notifications.
3. Make sure that the user's email address listed in their account profile is up to date.
4. Test an alternate browser and/or computer (either local or remote) to isolate whether the issue persists.
5. Validate the email settings in SharePoint admin.